Dr. Westin Childs Blog Posts & Articles | Page 33
High TSH normal T4: What does it mean?

High TSH & Normal T4: What Does it Mean? + Other Thyroid Lab Patterns

Are you experiencing a high TSH but normal T4? Are you confused about interpreting these values? Is your Doctor telling you that your tests are normal even though you are experiencing abnormal symptoms? This article will help shed light on this thyroid lab pattern and help you understand what it means.  You’ll learn more about …

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Why free T3 and total T3 are the most important thyroid lab tests

Why Free T3 & Total T3 are the Most Important Thyroid Lab Tests

The free T3 and total T3 lab tests are among the most important for evaluating thyroid function in your body.  These tests give vital information as to how your body is processing thyroid hormones.  And they give you information about the hormone that is responsible for activating your cells and turning on your genes.  These …

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Fasting for weight loss: How to use this therapy for weight loss

Fasting for Weight Loss: Does it Actually Work?

Fasting is probably the single cheapest and most effective weight loss tool that exists.  It doesn’t cost money to buy new foods, protein bars, protein powders, or supplements and all it requires is some willpower and the ability to refrain from eating.  But does it actually work? Will fasting help you lose weight, trim down …

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Subacute Thyroiditis Guide Recovery Time, Treatment, Diagnosis & More

Subacute Thyroiditis Guide: Recovery Time, Treatment, Diagnosis & More

Subacute thyroiditis may not be as common as other thyroid conditions, but it’s still a big problem for those who develop it. This condition may result in pain in your thyroid gland and can be confused with other disorders such as Hashimoto’s thyroiditis and Graves’ disease.  Learn how to diagnose this condition, how long it …

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Pros and Cons of Hormone Pellets Side Effects & More

Pros and Cons of Hormone Pellets: Side Effects & More

Are hormone pellets the holy grail of hormone replacement therapy? Do they really provide you with a hands-off, low-maintenance solution to your symptoms? Not exactly, but there’s a time and place for them to be used. If you were to ask me, though, I would tell you there are plenty of other, better options available. …

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Why is there so much controversy surrounding thyroid treatment

The Thyroid Controversy: Where Doctors Go Wrong

This is lesson #2 in my thyroid beginner series which is primarily designed for those who are building a foundation of knowledge in thyroid dysfunction or for those who have recently been diagnosed. 

Today we will be discussing why there is so much controversy surrounding thyroid treatment and why it can be difficult to get your doctor “on board”. 

Watch the video above for more info or read the text below if you prefer as well!

Please leave your questions in the comment section below so I can go over them in the next video!

Thyroid Controversy: Integrative vs Conventional Treatment

Why are so many thyroid patients unhappy with their current treatment?

Is it possible that our current approach or understanding of thyroid management is flawed?

I think this answer can be addressed by simply looking at how we approach and manage thyroid dysfunction and comparing that to other ways that we look at hormone imbalance in the body. 

Patients often find themselves in an unfortunate situation:

They have been diagnosed with thyroid issues and are experiencing thyroid symptoms even though they are already taking thyroid medication

If you fall into this situation you might be asking yourself this question… 

How is it possible for me to feel so terrible when my Doctor keeps telling me that my thyroid is “normal”?

And this is the thyroid controversy in a nutshell and it comes down to how Doctors look at and manage the thyroid.  

This approach to thyroid management has left thyroid patients frustrated which leads them to seek help on the internet, on forums, and on Facebook groups. 

With this in mind let’s take a look at how conventional doctors approach thyroid management and compare that to integrative doctors. 

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How Conventional Doctors Look at Thyroid Treatment

The standard and conventional approach, the approach that is taught in medical schools and residencies, is actually quite simple. 

I’ll outline it to you below (this is the way that I was taught and the way that most doctors are taught): 

  • If thyroid disease is suspected then check for a lab known as the TSH (thyroid stimulating hormone). 
  • If the TSH is high (defined as outside of the lab reference range) then initiate treatment. 
  • Treatment should always be done with T4-only thyroid medications such as Levothyroxine, Synthroid, or Tirosint
  • Adjust medication until the TSH is somewhere around 1.0 to 2.0. 
  • Any other symptoms related to thyroid disease (such as fatigue, weight gain, depression, constipation, cold skin, etc.) must be related to some other cause if the TSH is normal
  • Make adjustments to thyroid medication based on the TSH which is tested every 2-3 months. 

The main problem with this approach is that it is too rigid to allow for variability among patients. 

For instance:

How is it possible that all thyroid patients can do well on one medication?

Even when treating diseases such as cholesterol and high blood pressure Doctors have several sets of medications (1) that they will use and play around with but when it comes to the thyroid they are set on using one medication. 

Is it possible that some patients differ in their ability to utilize thyroid medication?

Some patients may react to the fillers or dyes in certain medications or vary in their ability to absorb medication from gastrointestinal issues. 

Problems such as lactose intolerance, Celiac disease or SIBO (2) can all influence how the body absorbs these medications. 

Is it possible that genetics may play a role in which medication works best for each person?

Doctors have no problem ordering genetic tests which outline how you metabolize anti-depressants, but they fail to consider that individuals can vary in how they metabolize hormones in the body. 

It is well known that individual genetics impact the pharmacokinetics and pharmacodynamics of medications and hormones in the body (3)!

These are just some of the reasons that taking such a rigid approach doesn’t make sense from a logical standpoint, but there are other reasons as well. 

Does Focusing on the TSH Make Sense?

The reliance upon TSH as a sole marker for thyroid function may not make sense when you compare it to other pituitary hormones and how Doctors treat those issues. 

To understand this let’s briefly discuss what TSH is and how it works:

TSH is known as thyroid stimulating hormone and it is secreted by the pituitary gland in your brain. 

TSH acts directly on the thyroid gland to stimulate the release of thyroid hormone (4).

So the higher your TSH is the more “stimulation” your thyroid gland gets and the more hormone your produce. 

But TSH isn’t the only hormone that is secreted by the pituitary gland which acts in a similar way. 

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Hormones such as LH, FSH, and ACTH all act to “stimulate” other organs to release their target hormones

But what’s interesting here is that whenever we look at other hormones, such as testosterone, we don’t care what the pituitary stimulating hormone level is, we care about the level of the hormone in the body (5)!

For instance:

If you feel that you have low testosterone in your body would it make sense for your Doctor to check your pituitary stimulating testosterone hormone or to directly check testosterone levels in the body?

Logically, it makes sense to check for the hormone. 

But that’s not what we do with the thyroid. 

Instead of looking at the hormone levels in your body, we check for the pituitary-stimulating hormone TSH. 

And instead of adjusting the dose based on how much hormone is in your blood, conventional doctors adjust it based on the TSH. 

But there’s a problem with that:

Studies have shown that patients who are treated with T4 thyroid medication to a “normal” TSH still have lower than normal free thyroid hormone levels which may account for the trouble that many patients experience. 

This can largely be solved with the use of both T4 and T3, but physicians still refuse to use these medications.

But back to the way that physicians normally dose and look at other hormones in the body for a minute. 

Consider these examples:

The TSH still has value and still should be checked in patients, but it may not be the single best marker to assess thyroid function in your body. 

How Integrative Doctors Look at Thyroid Treatment

So now that you understand how conventional Doctors (endocrinologists and primary care physicians) look at thyroid management we can compare that to how more integrative doctors evaluate patients with thyroid disease. 

And by integrative doctors, I am referring to doctors that may have extra training (outside of residency) in anti-aging medicine, integrative medicine or functional medicine. 

The problem with this type of training is that it is not “standardized” which means that not all “integrative doctors” look at each patient the same. 

Some doctors have used the term functional or integrative as a marketing tactic to simply get more patients even though they may not use a different approach from conventional physicians. 

But in an ideal world, your doctor should be evaluating you in the following way: 

  • Test for more than just the TSH – When evaluating your thyroid your free thyroid hormones (T3 and T4) give valuable insight as to how your body is absorbing and converting thyroid hormone. These free thyroid hormones (according to newer studies) track more closely with better outcomes when compared to other factors. 
  • Take into account individual genetics and preferences – Certain individuals are not able to convert or activate thyroid hormone at the same rate as others. SNPs in genes that control deiodinase enzymes can impact how you respond to T4-only thyroid medication (9). It is estimated that up to 15% of the population varies in their ability to convert T4 into the active T3 thyroid hormone. 
  • Take into account environmental factors such as stress, sleep, and diet – Lifestyle factors impact not only your thyroid but other hormones in your body as well! Your doctor should be treating you with more than just medications and supplements and should focus on the food that you put in your mouth and how you manage your stress. If they don’t address or ask about these questions then it may be time to seek a second opinion. 
  • Use more than just T4-only thyroid medications – In terms of thyroid medications, there is much more than just Synthroid and Levothyroxine. Other medications include NDT and T3/Cytomel/liothyronine. These thyroid hormones can be safe and incredibly effective if used appropriately. 

As a patient, which approach would you rather have?

The rigid approach of conventional medicine is algorithmic, and the more individualized/integrative approach which is fluid and dynamic. 

So What are you Supposed to Do? 

So what are you supposed to do if you feel terrible and your Doctor isn’t willing to work with you?

Learning and reading are steps in the right direction, but it’s not a substitute for a knowledgeable doctor who can guide you through the process. 

Your best bet is to seek out a physician who can help you and one who takes this more integrative approach. 

Unfortunately, these types of doctors can be very difficult to find and they often don’t take insurance. 

In order for these doctors to obtain this type of knowledge they usually have to do extra work and training after residency. 

This means that not all physicians are equal in their understanding of these concepts which means they can be difficult to find. 

I’ve put together a resource here that you can use to help find a knowledgeable physician in your area

Before you ask, I don’t know any or have personal recommendations to give you, or I would do so happily!

Because physicians have to learn this on their own we don’t have a secret group where we all talk or discuss patients. 

Conclusion

If you are struggling with your current thyroid management then it may be time to seek out a second opinion. 

Patients who have gone this route often report an increase in quality of life, an increase in energy, a reduction in weight, and many other benefits. 

Don’t waste the best years of your life with physicians who don’t take your complaints and symptoms seriously!

Life is too short and your health is too important. 

Now I want to hear from you:

Are you struggling with the current conventional approach?

Do you have questions about the integrative approach?

Which has worked for you? Which hasn’t?

Leave your comments below! 

#1. https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072414/

#2. https://www.ncbi.nlm.nih.gov/pubmed/28153426

#3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5299682/

#4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3433956/

#5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4772354/

#6. https://www.ncbi.nlm.nih.gov/pubmed/393456

#7. https://www.ncbi.nlm.nih.gov/pubmed/3139571

#8. https://www.ncbi.nlm.nih.gov/pubmed/6323158

#9. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1578599/

the thyroid controversy explained: where doctors go wrong
The complete guide to using Selenium to naturally enhance your thyroid

How To Use Selenium To Support Your Thyroid

Supplementing with selenium may provide a way to enhance your thyroid function in a natural way.  Whether you’ve heard of selenium before (or this is your first time), you’ll find all the information you need to get started with this micronutrient.  Today you’ll learn: Let’s dive in: Selenium & Thyroid Function Selenium is a micronutrient …

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T4 basics: the test, the medication, the hormone

T4 Thyroid Basics: The Test, The Medication, The Hormone

This is video #3 in my thyroid beginner series and today it’s all about T4. 

T4 is essential in understanding your thyroid because it’s actually 3 different things in one. 

T4 is a prescription medication, a hormone that your body produces naturally, and a test that you can order. 

Learn the differences, what they mean and how they can help you manage your thyroid: 

What is T4?

T4 is the most abundant thyroid hormone that your body produces naturally (assuming it’s working properly). 

It’s also known as Thyroxine which is the “official” or scientific name. 

If you hear someone refer to thyroxine just realize that they are referring to T4 and vice versa. 

So what’s the big deal with T4?

T4 is important in understanding your thyroid because it’s involved in the thyroid feedback system. 

T4 thyroid hormone molecular structure

T4 is produced by the thyroid gland after the gland is stimulated by TSH from the pituitary

T4 then circulates through the body where it is converted (on demand) by your cells into the active T3 thyroid hormone. 

If you have low circulating T4 then you will have low circulating T3 and this will cause the symptoms of hypothyroidism!

Let’s dive into the various definitions of T4 and how understanding what they mean can help you as a patient…

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T4 the Hormone

As I mentioned previously, T4 is the most abundant thyroid hormone in your body. 

Your thyroid produces two major thyroid hormones: T4 and T3

About 80% of the thyroid hormone that your thyroid produces is T4 or Thyroxine. (1)

This leaves around 20% left as T3 (the primary active thyroid hormone). (2)

But why does your body produces so much T4 relative to T3?

The reason is most likely related to the control of the thyroid system. 

For instance:

T4, by itself, is not an active thyroid hormone. (3)

It must be activated, by enzymes, into the active T3 thyroid hormone. (4)

So your thyroid spits out some amount of constant T3 (directly from the thyroid gland) and then converts the rest of T3 that it needs from the abundance of T4 in the bloodstream. 

This way it can control how much thyroid hormone your cells need based on the demands that YOU put on your body. 

I think it’s most helpful to consider the analogy of a dam. 

In this analogy the dam is thyroid conversion (T4 to T3 conversion), T4 is the water behind the dam, and T3 is the water that is allowed through the dam

By setting up this system your body can titrate and carefully control thyroid function. 

And this makes sense, considering how important your thyroid is to your entire body! 

T4 the Test

But what about T4 as a test?

It should come as no surprise that we can test the amount of T4 that your body produces naturally (or the amount that you take by medication) through the blood. 

Doctors can do this by ordering what is known as a “free T4” test. 

High free T4 and low TSH in hashimoto's

This test is incredibly important in understanding how your thyroid is functioning because it is THE primary hormone that your gland produces. 

In many cases, I believe that the T4 (and T3) hold more value than the TSH when evaluating thyroid function. 

You can read more about how and why TSH can fall short as a predictor of thyroid function in thyroid beginner series #2 here

But what does T4 tell you when you measure it?

Several very important things:

#1. It gives you an idea as to how your thyroid gland is functioning. 

Your thyroid gland is stimulated by the pro-hormone TSH. 

This hormone tells your thyroid gland to produce both T4 and T3. 

If you test for T4 and find that it is low then it can tell you how responsive your thyroid gland is to TSH. 

The normal hypothyroid lab pattern is usually a high TSH accompanied by a low free T4

And this makes sense if you think about it:

If your thyroid can’t produce T4 then it responds by increasing the amount of TSH to try and overstimulate the gland to produce more hormone. 

But if your thyroid can’t produce thyroid hormone because it is damaged then the TSH will remain raised and your T4 will remain low. 

This is the “standard” pattern that most patients who have hypothyroidism or Hashimoto’s present with. 

#2. It gives you an idea as to how well your body is converting T4 into T3. 

We’ve already discussed how important T3 is for thyroid function in your body. 

And testing for Free T4 can help you identify issues with this conversion process. 

How does it help?

You can test both Free T4 and Free T3 and look at the ratio between the two of these hormones. 

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Your T4 should be in a “healthy” range (usually the top 50% of the reference range) and your T3 should be in about the same range. 

If you have issues with T4 to T3 conversion you may see your T4 increase while your T3 decrease. 

In cases where your body isn’t able to produce thyroid hormone, you may see both the T4 and the T3 low. 

But both situations may be a clue that your body isn’t converting as well as it should. 

#3. It gives you an idea if you are absorbing or utilizing thyroid medication that you are taking by mouth. 

T4 can, and should, be tested when you are taking thyroid medication by mouth. 

It goes without saying, but in order for your body to actually “use” thyroid hormone that you take by mouth, it must be absorbed by your body. 

There are several factors, including the time of day that you take thyroid medication, (5) that can impact the rate at which you absorb thyroid medication. 

You can easily determine if you are absorbing thyroid medication by checking Free T4 before you start medication and 8 weeks afterward. 

You should see your Free T4 increase as you take thyroid medication and you should see your TSH drop. 

If these things don’t happen then you may need to consider that you are not adequately absorbing your medication. 

Other factors such as supplements, calcium, (6) and food intake can all impact how well you absorb thyroid medication (and this is why it’s generally recommended that you take thyroid hormone on an empty stomach). 

You can learn other tips and tricks to help maximize thyroid hormone absorption here

T4 the Medication

T4 is also the most commonly used thyroid medication. 

Prescription thyroid medications, especially those used by conventional doctors, contain T4 thyroid hormone. 

Medications that fit into this list include Synthroid, levothyroxine, Tirosint, and Levoxyl. 

These medications contain ONLY T4 or Thyroxine and should be compared to other medications which contain either combinations of T4 and T3 or just T3 alone. 

T4 has become the most commonly used thyroid medication over the last 30 years or so (7) because it is felt to be the most “consistent” thyroid medication and because it has the longest half-life (which means it stays in your bloodstream the longest). 

But it should always be remembered that your body naturally produces both T4 and T3 and that replacing only T4 may be part of the reason that so many patients remain symptomatic despite taking thyroid medication. 

Doctors only use T4 because they assume that your body will have no issue in converting T4 into T3. 

But this logic doesn’t take into account that each person converts T4 into T3 at a different rate and that we aren’t all equal in that regard. 

The problem with T4-only medications is that newer studies have shown that many people who use T4 have a lower than normal T3 (8) (the active thyroid hormone) even though they have a normal TSH. 

This approach to thyroid hormone replacement may be part of the reason that so many patients remain symptomatic despite having a “normal TSH”. 

It should also be noted that you can safely use T3/T4 thyroid medications without negative side effects provided they are used appropriately. 

Conclusion

That concludes our discussion on T4 basics!

Just remember that while T4 is an important thyroid hormone for your body, it is not as powerful as T3 thyroid hormone. 

But it still has value in terms of testing and using T4-only thyroid medication. 

Some people are able to use T4 thyroid medication and feel great while others may need some T3 to feel optimal. 

If you have thyroid problems make sure that you can differentiate between T4 the test, T4 the hormone, and T4 the medication

Now I want to hear from you:

Have you had your T4 tested? Was it low or normal?

Are you taking T4 medication? Is it working for you?

Why or why not?

Leave your comments below! 

#1. https://www.ncbi.nlm.nih.gov/pubmed/12915350

#2. https://www.ncbi.nlm.nih.gov/pubmed/12915350

#3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4699302/

#4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3673746/

#5. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4650787/

#6. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3092723/

#7. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4980994/

#8. https://www.thieme-connect.de/DOI/DOI?10.1055/s-0043-125064

what you need to know about t4 thyroid hormone
Is Natural Desiccated Thyroid (NDT) the Best Thyroid Medication?

Is Natural Desiccated Thyroid (NDT) the Best Thyroid Medication?

Natural desiccated thyroid is a thyroid medication that comes from pigs!

This medication contains a more “complete” profile of thyroid hormones when compared to almost all synthetic thyroid medications out there. 

This has led many people to tout NDT as the “best” thyroid medication. 

In this article, we are going to explore this claim while also discussing the pros and cons of this medication. 

You’ll learn who should use this medication, who should avoid it, and the pitfalls of using it

Let’s dive in: 

What is NDT or Natural Desiccated Thyroid Hormone?

NDT or natural desiccated thyroid hormone is simply a type of thyroid hormone medication. 

It can be used to treat people who have low levels of thyroid hormone in their body from conditions like Hypothyroidism and Hashimoto’s thyroiditis. 

NDT is often claimed to be one of the “best” thyroid medications out there because it’s considered to be all-natural. 

So, with this in mind, let’s break apart what NDT actually is. 

First:

Where does NDT come from?

NDT is porcine-derived which means that it comes from pigs. (1) 

To get NDT, people must take the thyroid gland of pigs and desiccate or dry it out. 

From there it is standardized to a specific dose and contains 38mcg of T4 (the inactive thyroid hormone) and 9mcg of T3 (the active thyroid hormone) in each grain. 

Grain is just a way to standardize the dose of NDT between different brands. 

Natural desiccated thyroid also contains other hormones and prohormones such as other types of thyroid hormone (T1 and T2).

These hormones are not nearly as active as T4 and T3 but they are thought to play an important physiologic role in the body otherwise, (2) why would your body produce them?

Each grain of NDT contains around 76% T4 and around 23% T3 which is a ratio close to the 80% T4 and 20% T3 that your thyroid produces naturally when it is healthy. 

For this reason, and because it contains prohormones, and because it comes from a natural source, (3) many people believe it is one of the most complete thyroid medications out there! 

While this may be true, it doesn’t mean that it works equally well for every single person. 

Let’s dig into the basics of NDT and talk about why it may not be the best medication. 

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Natural vs Synthetic Hormones

NDT is considered to be natural because it is sourced from a “natural” source, pigs. 

This sourcing of thyroid hormone is different from the approach used to create other formulations of medications such as Levothyroxine and Synthroid

Other medications are created in a laboratory from other basic compounds. (4) 

But you must always remember that ALL types of thyroid medications are considered to be bio-identical which is very important. 

Bio-identical means that the hormones you are taking by mouth are considered to be IDENTICAL to the hormones that your body produces naturally!

Where these medications differ is in the SOURCE. 

The source for NDT is from pigs while the source for Levo and Synthroid is other chemical structures. 

Some people believe that naturally sourcing thyroid hormone is superior to creating it chemically in a lab. 

From my perspective, there is no difference between thyroid hormone from a human or a pig when compared to thyroid hormone created in a lab

Both compounds look the exact same and function in a similar way in the body. 

Where they differ is in the other hormones and pro-hormones that come in NDT formulations. 

NDT Brands

Let’s take a second to discuss the various brands of natural desiccated thyroid hormones out there. 

There are several “well-known” brands and some less well-known brands. 

What you need to understand is that these medications do differ in the type of active and inactive ingredients in them but they all contain both T4 and T3 thyroid hormones. 

While it may not sound like the inactive ingredients make a big difference, they actually may be the reason that some people simply can’t tolerate certain types of NDT brands. 

For instance:

It’s not uncommon for someone to be on Armour thyroid but not feel well when switching to NP thyroid even if their dose stays the same. 

These differences are likely the result of how your body interacts with the inactive ingredients and how difficult it is for your intestines to break down and absorb the hormones in the medication. 

What that means for you is that if you don’t tolerate one type of NDT brand it doesn’t mean you won’t tolerate all of them. 

Instead, you may want to switch to a couple of different brands to see if you can find one that works for you. 

With that in mind, you can find a list of NDT brands below: 

Is NDT Superior to T4 Medication for Hypothyroidism?

It is largely felt by many online communities that natural desiccated thyroid is the single “best” thyroid medication out there. 

This logic has led people to believe that if you are taking NDT and it isn’t working for you that the problem must be with your dose and not with the medication itself. 

I’m not a fan of this approach and don’t believe that when it comes to your thyroid that there is a single “best” thyroid medication

A better approach is to always listen to your body while you look at other problems beyond your thyroid

Thyroid tunnel vision can lead you to believe that every problem you have is associated with your thyroid and that adjusting your dose is the solution to this problem. 

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This approach to management has led many patients to take higher than necessary doses of thyroid medication which can be dangerous! 

So, while NDT is a great medication, it’s certainly not the “best” or the only thyroid medication available. 

The type of thyroid medication that you use, and your dose, should be individualized to YOUR body. 

Natural Desiccated Thyroid for Weight Loss

One important note worth mentioning is that of weight loss and NDT. 

Some studies, like this one, have shown that switching to NDT does result in modest weight loss in certain patients. (5) 

This particular study took a look at 70 patients that were already taking T4 medication (Levothyroxine). 

This group of patients was taking this medication and despite having a normal TSH still had some symptoms of hypothyroidism. 

Thyroid lab tests in patients taking natural desiccated thyroid compared to T4

These patients were then randomized and given NDT (desiccated thyroid extract) for 16 weeks and then placed back on their old medication. 

During the period that these patients were taking NDT, they noticed around a 3-pound weight loss on average and roughly 50% of patients taking NDT wanted to stay on it. 

Not only did they lose weight but they also reported feeling much better on the medication in a subjective sense (based on their own opinion). 

3-4 pounds may not sound like a big deal to you, but when you realize that weight is incredibly difficult to lose when you have hypothyroidism this is actually a great feat. 

But does this mean that the weight loss is due to NDT itself or simply due to the T3 in the medication?

While we don’t have definitive studies, it’s logical to believe that the same results would have been achieved by simply adding T3 (in the form of Cytomel or Liothyronine) to existing doses of T4 in these patients. 

So, while NDT can certainly help you lose weight if you have hypothyroidism, don’t fall into the trap of believing that the weight loss is caused by the NDT itself. 

Instead, the weight loss is most likely the result of IMPROVING the total T3 and free T3 levels in your body! 

And this can be done with T3 medication of any type. (6) 

Common Problems and Symptoms when using NDT

Let’s talk about some of the problems associated with NDT use. 

The way that your body responds to NDT is going to be different from other people out there. 

This means that the type of NDT that you use, and the dose that you use, all may potentially lead to problems. 

What’s important is to focus on how YOU feel and how YOU tolerate the medication. 

By listening to your body, and by checking your thyroid lab tests, you can be certain that you are taking the right dose for your body. 

You can find a list of the most common problems that patients experience when they use NDT below: 

  • Some people take too much natural desiccated thyroid hormone – (7) Overdosing on NDT is a common problem because many people believe that higher doses will somehow improve their thyroid function. This leads to overdosing and symptoms of hyperthyroidism in some patients. This problem stems from “thyroid tunnel vision”.
  • Dosing is static which means you can’t tweak the T4 and T3 concentrations – NDT comes in a static dose of 38mcg:9mcg of T3. This means that you can’t individually adjust the amount of T3 in the medication without also adjusting the T4. You might do great on 38mcg of T4 but may need something like 5mcg of T3. If you fall into this category then you can’t adjust your medication. 
  • May lead to variations in free T3 & Free T4 levels – Some people experience very high free T3 levels and very low free T4 levels even when using low doses of NDT. This problem probably has to do with how each individual processes thyroid hormone in their body. 
  • Symptoms arise from the use of T3 which can be difficult to manage in some patients – (8) Some patients are exquisitely sensitive to even incredibly low doses of T3. These are patients that would probably do fine on certain types of T4 medication (such as Tirosint) but do poorly when they start even low doses of NDT. 
  • May be hard to break down for some patients in the intestines – This problem isn’t unique to NDT medications, but it’s worth considering if you have intestinal issues. Inactive dyes and fillers may cause reactions and may make the digestion of NDT difficult. 
  • May lead to immunogenic reaction (may not be ideal for patients with Hashimoto’s) (9) – There is a theoretical risk that taking a foreign pig-derived substance can “flare” up the immune system and worsen thyroid function in patients with Hashimoto’s thyroiditis. I don’t think this is a reason to completely avoid NDT if you have Hashimoto’s thyroiditis but you should be aware that it can happen.

Overdosing on NDT

Believe it or not but doctors have been using NDT since the 1950s!

Even back then it wasn’t uncommon for doctors to prescribe high doses of NDT (up to 3 to 8 grains per day) to patients. (10)

This was way before thyroid lab tests were created, so dosing was often based on the “Basal metabolic rate” which is a marker for metabolism. 

These doctors found that increasing the dose of NDT did result in modest weight loss by increasing the metabolism, but once the dose was lowered, the metabolism of the patient went back down to below-normal levels. 

This is as relevant today as it was back then. 

Currently, many people believe that by simply increasing their dose of NDT that they will finally feel better and relieve their symptoms. 

This happens frequently in patients who are suffering from weight gain. 

This leads to higher and higher doses of NDT which dramatically suppresses the TSH and temporarily helps with weight loss. 

But the unintended effect is that it may also cause long-term harm because of the high dose of NDT being used. 

Studies dating back to the 1950s showed that if you are responsive to NDT you only need a small dose (usually 1-2 grains) to improve your symptoms and improve your metabolism. (11) 

If you are still feeling symptomatic at that point then some of your symptoms are likely related to some other problem or some other hormone imbalance!

You can avoid these potential negative side effects by using only the appropriate dose and by monitoring your thyroid lab tests in the process. 

Who should use NDT

NDT is a great medication and many people out there stand to benefit from its use. 

I’ve compiled a list of just some of the patients that tend to do the “best” on this medication below: 

  • Those who have failed T4 medication – If you’ve been on T4 medication such as Levothyroxine or Synthroid and you just aren’t feeling well after 6-8 weeks then it may be time to consider a T4/T3 combo medication. 
  • Those with low free T3 levels (usually need a T3 medication) – Up to 15% of the population suffers from thyroid conversion issues which means they don’t convert T4 into T3 as well as other people. If you fall into this category you may have a “normal TSH” but your free T3 and total T3 levels may be lower than normal. If you fall into this category then adding T3 (from either NDT or Liothyronine) may help bring these levels up and help you feel better. 
  • Those who are post-thyroidectomy – Your thyroid (when functioning normally) produces around 80% T4 and around 20% T3. If you don’t have a thyroid, because it was removed or destroyed, then it makes sense to supplement with thyroid hormones close to this ratio. Most post-thyroidectomy patients take only T4 medications (so 100% T4) which do not contain T3. Some of these patients don’t feel well despite having a normal TSH. Taking NDT can provide your body with T3 in a ratio that is close to what your body produces naturally and may help those without a thyroid. (12)

This is not an all-inclusive list but it can help get you started! 

Conclusion

Natural desiccated thyroid is a thyroid medication that contains both T4 and T3. 

Because of this, it may be one of the better thyroid medications (but not the best!) out there. 

If you have thyroid issues and are struggling with low free T3 levels, weight gain, and/or other symptoms despite having a normal TSH, then this medication may help you

When using it be careful to watch for side effects such as anxiety, heart palpitations, or hot flashes which may indicate that your dose is too high. 

Now I want to hear from you:

Are you taking NDT? Is it working for you?

Are you not tolerating NDT?

Is it causing negative symptoms?

If so, leave your comments or questions below!

I’ll do my best to respond to each comment. 

Scientific References

#1. https://www.ncbi.nlm.nih.gov/pubmed/10365676

#2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4272398/

#3. https://www.ncbi.nlm.nih.gov/pubmed/15253676

#4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4146262/

#5. https://www.ncbi.nlm.nih.gov/pubmed/23539727

#6. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5965938/

#7. https://www.ncbi.nlm.nih.gov/pubmed/29942726

#8. https://www.sciencedirect.com/science/article/pii/B9780323189071000883

#9. https://www.ncbi.nlm.nih.gov/pubmed/9545109

#10. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1642898/?page=1

#11. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4980994/

#12. https://www.ncbi.nlm.nih.gov/pubmed/23072197

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