T3 Conversion BoosterT3 Thyroid Support Supplement (60 Day Supply)
$43.99 — or subscribe to save 10%
- Maximize T3 Activation: Uses zinc and selenium to activate the enzymes that convert inactive T4 into active, fat-burning T3.*
- Stop Reverse T3 Production: Features ashwagandha and guggul to lower inflammation and prevent reverse T3 braking of your thyroid.*
- Enhance Cellular Sensitivity: Includes vitamins A and E in the forms required by your thyroid receptors to bind T3 and activate your metabolism.*
- Target Liver Conversion: High-potency botanicals support your liver, the primary site where your body activates thyroid hormone.*
What’s inside
- Guggul extract 500 mg, Ashwagandha 200 mg
- Zinc (citrate), Selenium (l-selenomethionine)
- Vitamins A and E in receptor-ready forms
- Iodine 75 mcg from Icelandic kelp, paired with selenium
- Rosemary extract (rosmarinic acid)
No wheat, gluten, soy, dairy, artificial colors or sweeteners. See doses and research below.
How to use
2 capsules each day before noon, with or without food. If you take thyroid medication, leave 30 to 60 minutes on either side. Each bottle is a full 60 day supply.
Shipping and returns
Free US shipping on every order, processed within 1 business day, arriving in 1 to 3 days via USPS. 60 day money-back guarantee: if it does not work for you, return it for a full refund. No questions asked.
Why most thyroid patients stay tired
Stop storing your thyroid hormone and start activating it
Standard thyroid treatments like levothyroxine give you only the storage form of thyroid hormone. Most thyroid patients have no idea.
Unless your body activates that stored hormone into T3, the stubborn symptoms stay exactly where they are.[20] I created T3 Conversion Booster to break that cycle.[22][29]
Dr. Westin ChildsThyroid specialist and formulator
Your medication gives you T4
T4 is the storage form of thyroid hormone. On its own, it is inactive.
Your body must convert it to T3
T3 is the active hormone your cells actually use. When conversion falters, symptoms stay even with “normal” labs.[20][21]
This formula supports that step
Zinc, selenium, guggul and six more ingredients support the conversion process itself.*
What is inside
Eight ingredients, each at a dose that does something
No proprietary blends hiding the amounts. Every ingredient is here because the research says it supports one of the steps your body needs to make and use T3.
The actual label, straight off the bottle. Click to enlarge.Guggul extract 500 mg
Sourced from the sap of trees native to India. Research shows it can help support thyroid conversion and immune health.[20]
Ashwagandha 200 mg
An adaptogenic compound shown to support thyroid and adrenal function, balanced TSH levels, muscle mass, and recovery.[7]
Zinc zinc citrate
An essential mineral that supports healthy thyroid and immune function as well as thyroid cellular sensitivity, which makes it ideal for T3 support.[22][24]
Selenium l-selenomethionine
Required by your body to use the enzymes known as selenoproteins. These proteins support thyroid conversion and glutathione.[29][32]
Vitamin A retinyl palmitate
A fat-soluble vitamin involved in regulating thyroid hormone at the cellular receptor. It supports T3 binding and activation.[1][3]
Iodine Icelandic kelp, 75 mcg
Used by the thyroid gland to create T4 and T3. Low iodine states may lead to reversible low thyroid function. Paired with selenium and kept well under the 300 mcg upper range.[16][17]
Vitamin E d-alpha tocopheryl
An antioxidant that may support a healthy immune system, which may translate to less thyroid gland damage in states of Hashimoto’s.[10][11]*
Rosemary extract rosmarinic acid
Flush with rosmarinic acid, carnosic acid, and carnosol, which have antioxidant and immune-modulating supporting effects.[13]
Real-world patient outcomes
What thyroid patients actually report
Pulled from verified Stamped reviews of T3 Conversion Booster, not from a study we paid for.
“This product has been life changing. Most of all I notice help with brain fog and afternoon fatigue. I notice a MAJOR difference when I have forgotten to take it a couple days in a row.”
Thank you!
My experience has been fantastic. I have way more energy, no hair shedding and I overall feel 100% better. I just ordered three more months of the T3 Booster.
Bloodwork improved
After 3 months of using, my thyroid bloodwork came back improved, my T3 was higher. I have more energy and the afternoon slump has decreased. My doctor said keep taking it.
Great stuff
I ditched Synthroid last year and went with Dr. Childs’ Thyroid Glandular, but when I added T3 Conversion Booster I could really feel more energy and more stability.
Best vitamin
I have not had an elevated T3 in over two decades. I cannot take Cytomel. I have not had consistent energy on a daily basis in over two decades. I can never stop taking this.
Feel ALIVE
The biggest change is having the energy to do more than the absolute essential tasks. It is enjoyable to be with friends now rather than wanting to go home and take a nap.
Free T3 back to normal
This supplement definitely helped boost my T3 levels. Taken with prescribed liothyronine, my free T3 level is back to normal acceptable values, and proven with how good I feel.
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Verified reviews
In their own words
Real reviews from the review system on this site. Verified buyer means the review is tied to a completed order.
Great product. Already noticing more energy. I don’t feel like I’m moving through quicksand as badly since being on this supplement. I only convert half of my T4 to T3 and haven’t had any luck even with natural thyroid replacement. But I can tell a difference in hair and energy on these. Thankful for the great combination.
I am definitely feeling a difference in the morning with my energy level. I do not feel as sluggish upon waking. I just started taking an afternoon dose as well and feel much more awake with sustained energy into the evening. This seems to be the missing link I was needing to support my thyroid along with the desiccated compounded thyroid med I take.
T3 Conversion Booster is GREAT. In only four days there is a big difference in me. Very good quality product and it works. I love it, especially the guggul and ashwagandha in it.
Shipped very quickly. Easy to swallow. Just started today but feel like I have more energy.
Excellent customer service and speedy delivery. Feeling better already. I’ve especially noticed more energy.
Love anything from this store!! High quality, fantastic results.
“Can I take my liothyronine with the conversion booster? I am also on levothyroxine.”
T3 Conversion Booster is designed to be taken alongside thyroid medication, but not at the same time of day, since that may reduce absorption. It can be used with all types of thyroid medication.
Your new schedule
Two capsules, once a day, before noon
- 1Take 2 capsules each morningWith or without food, any time before noon.
- 2Space it from your thyroid medicationIf you take levothyroxine, NP Thyroid or similar, leave 30 to 60 minutes on either side.
- 3Stay consistentOne bottle is a full 60 days. The subscription exists so you never break the streak.
What to expect
Your body loads up
The nutrients build toward a steady state. Most people feel little change yet, and that is normal.
Early improvements
Around the 6 week mark your body reaches steady state.[20] This is when energy and well-being typically start to shift.
The full effect
Improvement continues to build over several months. Judge it by how you feel, and remember the 60 day guarantee covers your first bottle either way.**
How it compares
See how T3 Conversion Booster stacks up
| T3 Conversion Booster | Other thyroid supplements | Thyroid medication (Rx) | Regular supplements | |
|---|---|---|---|---|
| Made for thyroid patients | ✓ | ✓ | ✓ | ✕ |
| Thyroid safe | ✓ | ? | ✓ | ✕ |
| Created by a thyroid expert | ✓ | ? | ✕ | ✕ |
| Supports T3 conversion | ✓ | ? | ✕ | ✕ |
| Proven ingredients | ✓ | ? | ✓ | ? |
| Therapeutic dosing | ✓ | ✕ | ✓ | ✕ |
| Usable with thyroid meds | ✓ | ? | ✓ | ? |
| Available without prescription | ✓ | ✓ | ✕ | ✓ |
| 60 day money-back guarantee | ✓ | ✕ | ✕ | ✕ |
Frequently Asked Questions
Can it be taken if I’m already taking thyroid medication?
Yes! T3 Conversion Booster was designed to be used with all thyroid medications, including those that contain T3 like Cytomel and liothyronine, and formulations of NDT like Armour Thyroid, NP Thyroid, and Adthyza.
For best results, take it 30-60 minutes away from your thyroid medication (either before or after).
Will it increase my free T3 levels?
In short, maybe, but not always.
In general, thyroid support supplements typically do not have a big impact on thyroid lab tests, especially when compared to prescription thyroid medications.
This is because they each contain different ingredients, and each has a different mechanism of action.
Thyroid medications typically have a bigger impact on thyroid lab test levels like TSH, free T3, free T4, and reverse T3.
Thyroid support supplements like T3 conversion boosters tend to work more at the cellular level, which impacts symptoms but doesn’t always impact thyroid lab test results.
This isn’t always the case, though, as some people do see changes to their lab tests when using these types of supplements.
But because of the reasons listed above, the best way to determine if it’s working for you is by evaluating how you are feeling, not your thyroid lab tests.
Can I use it if I have hyperthyroidism?
T3 Conversion Booster is considered a low thyroid support supplement, so you generally would not want to take it if you are in a state of thyroid overactivity or hyperthyroidism.
Having said that, there are a few situations where it may make sense to use low thyroid support if you have been labeled with hyperthyroidism:
#1. If your thyroid has been surgically removed. If your thyroid has been removed, then you are considered to be hypothyroid even if the reason for the removal was due to hyperthyroidism.
#2. If your thyroid has been ablated with radioactive iodine. If your thyroid has been ablated, then you are considered to be hypothyroid even if the reason for the ablation was due to hyperthyroidism.
#3. If you are undergoing block and replace therapy or add-back therapy for hyperthyroidism.
Block and replace therapy is an uncommon treatment used in some situations where a patient with hyperthyroidism will take both thyroid medication like levothyroxine as well as thyroid blocking medication like methimazole.
If you are undergoing this kind of treatment (which is uncommon), then you can consider thyroid support supplements as well.
In general, if you are using thyroid-blocking thyroid medication like methimazole, then you probably shouldn’t use T3 Conversion Booster.
On the other hand, if you are taking any sort of thyroid medication replacement like levothyroxine (or any others), then you can consider using T3 Conversion Booster.
Can I take it if my reverse T3 levels are elevated?
Absolutely!
If you are trying to lower reverse T3 levels, then focusing on free T3 makes a lot of sense.
Here’s why:
Your body has the option to turn T4 into either T3 or reverse T3.[20][21] When you push the pathway down the T4 to the T3 route, you will necessarily reduce how much T4 is available for reverse T3 production.
In other words, anything that decreases T4 to reverse T3 conversion will increase free T3, and anything that increases T4 to T3 conversion will decrease reverse T3.
Is it still helpful if my thyroid has been removed or ablated?
Yes! T3 Conversion booster is still beneficial to those without a thyroid and for those with a nonfunctioning thyroid gland (those who have undergone RAI).
The reason is simple:
Even if you don’t have a thyroid gland, you still need to produce T3, and because thyroid conversion occurs outside of the thyroid gland[20], it doesn’t really matter if your thyroid is present or not.
It can be argued that T3 Conversion Booster is even more important for those who no longer have a thyroid gland because they are all almost exclusively taking T4-only thyroid medications like levothyroxine, which require conversion to become active.
Can I take it if I’m pregnant or breastfeeding?
T3 Conversion Booster contains two ingredients that can sometimes be problematic for those who are pregnant: vitamin A and ashwagandha.
These aren’t necessarily harmful, but you will get differing opinions on their use during pregnancy, depending on who you are talking to.
For this reason, we always recommend that you get approval from your ob/gyn or midwife (or whoever is caring for you during pregnancy) prior to using any supplement, including this one.
Will it still work if I’m not taking thyroid medication?
Yep! You don’t need to be taking thyroid medication in order for T3 Conversion Booster to be beneficial.
It just so happens that most people who take it are already taking thyroid medication as well, but there are plenty of people who aren’t, and they have had success using it.
If this supplement is so great, then why doesn’t my doctor know about it?
Great question!
We’d all like to believe that our doctors are 100% up to date on the latest research as it pertains to all aspects of our health and thyroid, but that just isn’t the case.
If they were, then we wouldn’t have an epidemic of unhappy thyroid patients who still struggle with low thyroid symptoms despite taking their thyroid medication and doing everything else correctly.
For now, the existing thyroid treatment paradigm leaves a lot to be desired, which means extra help outside of traditional medications and treatments is often needed.
These treatments, in the form of supplements and lifestyle changes, are only necessary for those people who are not feeling 100% right now.
If you are someone who is not experiencing symptoms like fatigue, weight gain, cold intolerance, pain, depression, and so on, then you’d have no need to use thyroid support supplements like T3 Conversion Booster.
But if you are like many other thyroid patients out there who are still suffering, then it would be worth considering!
Will using this supplement cause my T3 levels to be too high?
Nope!
Instead of containing T3 thyroid hormone, T3 Conversion Booster contains natural ingredients that help your body produce a healthy level of T3.
This means that there is never a risk of overproducing T3 and that it can be added to medications that contain T3.
How do you take it?
The recommended dose is 2 capsules taken each day (with or without food) before noon and at least 30-60 minutes away from your thyroid medication (if you take any).
At 2 capsules each day, this supplement will provide you with a 60-day supply.
What’s the difference between T3 Conversion Booster and T3 thyroid medication?
Unlike Cytomel and liothyronine, which contain T3 thyroid hormone, T3 Conversion Booster contains all-natural ingredients in the form of vitamins and botanical ingredients.
How long should I take T3 Conversion booster?
T3 Conversion Booster can be taken indefinitely, and I recommend using it for as long as it is helping you feel better.
How long does it take to work?
Thyroid function is slow to respond when compared to other hormone systems in the body.
It takes 6 weeks of daily use of any thyroid hormone or thyroid support supplement before your body will reach a steady state[20], which means it will take at least this long before you start noticing a difference in how you feel.
After 6 weeks, you will start to see some improvement, but it may take several months for you to feel its full effects.
How do I know if it’s working?
The best way is to pay attention to how you are feeling! Most people know it’s working because they feel an increase in energy, an improvement in well-being, and an improvement in their thyroid symptoms.
What type of improvement you may experience depends largely on how your thyroid is impacting your overall health.
Each person has a slightly different set of symptoms, so how they respond to T3 Conversion Booster will vary as a result of this.
Do I need to test my T3 or thyroid before using it?
No, getting your T3 tested is not required before using this supplement. Having said that, you are certainly welcome to do that if you’d like!
Are there any side effects?
Over the last 8 years, tens of thousands of thyroid patients have used T3 Conversion Booster, and it is generally very well tolerated.
Yes! In addition, it does NOT contain wheat, gluten, yeast, soy protein, dairy products, fish, shellfish, peanuts, tree nuts, eggs, artificial colors, artificial sweeteners, or artificial preservatives.
Is the iodine in this supplement safe to take?
Yes! T3 Conversion Booster has been used by thousands of patients with Hashimoto’s without any issues.[18] I formulated T3 Conversion Booster with a small dose of iodine accompanied by selenium to protect against any iodine-related issues.
Remember: Iodine is required by all humans because we can’t produce it on our own, and we need it for thyroid hormone production.[16][19] The key to using iodine safely is to use the right dose and combine it with selenium. This supplement was specifically formulated to meet these requirements, which is why it is quite safe.
Each serving of T3 Conversion Booster contains 75mcg of Iodine, which is well below the recommended high range of iodine intake of 300mcg per day.
How does shipping work?
All domestic orders receive free shipping regardless of price. Orders are typically processed within 1 business day, are shipped out via USPS Ground Advantage, and typically arrive within 1-3 business days.
We also offer intentional shipping to most countries! International orders ship free if the order value is greater than $250 USD. Otherwise, the price of shipping is calculated on the checkout page. We primarily use USPS for international shipments.
What is your Return/Refund Policy?
All of my products come with a 60-day money-back guarantee. I’m confident that my products will work for you, but in case they don’t, for whatever reason, you can return them for a full refund within 60 days. It makes purchasing them a no-brainer!
You can find more information about our return and refund policy by clicking here.
Are your supplements regulated for quality?
Yep!
We go above and beyond what is required by the FDA for supplement companies.
Every single lot that we produce is third-party tested for heavy metals, pathogens, bacteria, mold, and yeast.
The results are then displayed publicly on this page.
What if I have other questions?
Don’t hesitate to reach out! Please email us at hello@restartmed.com and we will do our best to get back to you within a day or so! You can also call us here: (480) 331-9431.
Questions about our quality standards? Please see this article for more information.
Buying with confidence
If it does not work, you do not pay for it
60 day money-back guarantee
Return it within 60 days for a full refund. No questions asked and no hoops to jump through.
Third-party tested, every lot
Tested by an ISO-accredited lab for heavy metals, pathogens, bacteria, mold and yeast. See the results
Free domestic shipping
Every US order ships free via USPS regardless of price, usually processed within one business day.
T3 Conversion Booster
$43.99 or $39.59 with subscribe and save. 60 day supply.
Scientific References
View All References
1. Farhangi, M.A., et al. (2012). The effect of vitamin A supplementation on thyroid function in premenopausal women. Journal of the American College of Nutrition. doi:10.1080/07315724.2012.10720431.
2. Morley, J.E., et al. (1981). The interrelationship of thyroid hormones with vitamin A and zinc nutritional status in patients with chronic hepatic and gastrointestinal disorders. American Journal of Clinical Nutrition.
3. Zimmermann, M.B., et al. (2004). The effects of vitamin A deficiency and vitamin A supplementation on thyroid function in goitrous children. Journal of Clinical Endocrinology and Metabolism. doi:10.1210/jc.2004-0862.
4. Oba, K., et al. (1980). Effects of vitamin A deficiency on thyroid function and serum thyroxine levels in the rat. Journal of Nutritional Science and Vitaminology.
5. Mackawy, A.M.H., et al. (2013). Vitamin D Deficiency and Its Association with Thyroid Disease. International Journal of Health Sciences. doi:10.12816/0006054.
6. Kim, D. (2017). The Role of Vitamin D in Thyroid Diseases. International Journal of Molecular Sciences. doi:10.3390/ijms18091949.
7. Talaei, A., et al. (2018). The Effects of Vitamin D Supplementation on Thyroid Function in Hypothyroid Patients: A Randomized, Double-blind, Placebo-controlled Trial. Indian Journal of Endocrinology and Metabolism. doi:10.4103/ijem.IJEM_603_17.
8. Kim, D. (2017). The Role of Vitamin D in Thyroid Diseases. International Journal of Molecular Sciences. doi:10.3390/ijms18091949.
9. Mackawy, A.M.H., et al. (2013). Vitamin D deficiency and its association with thyroid disease. International Journal of Health Sciences.
10. Pan, T., et al. (2013). Levothyroxine replacement therapy with vitamin E supplementation prevents oxidative stress and cognitive deficit in experimental hypothyroidism. Endocrine. doi:10.1007/s12020-012-9801-1.
11. Venditti, P., et al. (2013). Vitamin E management of oxidative damage-linked dysfunctions of hyperthyroid tissues. Cellular and Molecular Life Sciences. doi:10.1007/s00018-012-1217-9.
12. Mano, T., et al. (1998). Vitamin E and coenzyme Q concentrations in the thyroid tissues of patients with various thyroid disorders. American Journal of the Medical Sciences.
13. Napolitano, G., et al. (2019). Vitamin E Supplementation and Mitochondria in Experimental and Functional Hyperthyroidism: A Mini-Review. Nutrients. doi:10.3390/nu11122900.
14. Ye, S., et al. (2017). Role of levothyroxine and vitamin E supplementation in the treatment of oxidative stress-induced injury and apoptosis of myocardial cells in hypothyroid rats. Journal of Endocrinological Investigation. doi:10.1007/s40618-017-0624-z.
15. Yu, S., et al. (2011). Vitamin E ameliorates iodine-induced cytotoxicity in thyroid. Journal of Endocrinology. doi:10.1530/JOE-11-0032.
16. Chung, H.R. (2014). Iodine and thyroid function. Annals of Pediatric Endocrinology and Metabolism. doi:10.6065/apem.2014.19.1.8.
17. Zimmermann, M.B. and Boelaert, K. (2015). Iodine deficiency and thyroid disorders. The Lancet Diabetes and Endocrinology. doi:10.1016/S2213-8587(14)70225-6.
18. Markou, K., et al. (2001). Iodine-induced hypothyroidism. Thyroid. doi:10.1089/105072501750362730.
19. Ahad, F. and Ganie, S.A. (2010). Iodine, Iodine metabolism and Iodine deficiency disorders revisited. Indian Journal of Endocrinology and Metabolism. doi:10.4103/2230-8210.53917.
20. Nussey, S. and Whitehead, S. (2001). The Thyroid Gland. In: Endocrinology: An Integrated Approach. BIOS Scientific Publishers.
21. Obregon, M.J., et al. (2005). The effects of iodine deficiency on thyroid hormone deiodination. Thyroid. doi:10.1089/thy.2005.15.917.
22. Betsy, A., et al. (2013). Zinc deficiency associated with hypothyroidism: an overlooked cause of severe alopecia. International Journal of Trichology. doi:10.4103/0974-7753.117690.
23. Maxwell, C. and Volpe, S.L. (2007). Effect of zinc supplementation on thyroid hormone function. Annals of Nutrition and Metabolism. doi:10.1159/000103324.
24. Severo, J.S., et al. (2019). The Role of Zinc in Thyroid Hormones Metabolism. International Journal for Vitamin and Nutrition Research. doi:10.1024/0300-9831/a000262.
25. Mahmoodianfard, S., et al. (2015). Effects of Zinc and Selenium Supplementation on Thyroid Function in Overweight and Obese Hypothyroid Female Patients. Journal of the American College of Nutrition. doi:10.1080/07315724.2014.926161.
26. Ertek, S., et al. (2010). Relationship between serum zinc levels, thyroid hormones and thyroid volume following successful iodine supplementation. Hormones. doi:10.14310/horm.2002.1276.
27. Bucci, I., et al. (1999). Zinc sulfate supplementation improves thyroid function in hypozincemic Down children. Biological Trace Element Research. doi:10.1007/BF02784425.
28. Paulazo, M.A., et al. (2019). Hypothyroidism-related zinc deficiency leads to suppression of T lymphocyte activity. Endocrine. doi:10.1007/s12020-019-01936-7.
29. Ventura, M., et al. (2017). Selenium and Thyroid Disease: From Pathophysiology to Treatment. International Journal of Endocrinology. doi:10.1155/2017/1297658.
30. Gorini, F., et al. (2021). Selenium: An Element of Life Essential for Thyroid Function. Molecules. doi:10.3390/molecules26237084.
31. Kohrle, J. (2015). Selenium and the thyroid. Current Opinion in Endocrinology, Diabetes and Obesity. doi:10.1097/MED.0000000000000190.
32. Arthur, J.R., et al. (1992). The role of selenium in thyroid hormone metabolism and effects of selenium deficiency on thyroid hormone and iodine metabolism. Biological Trace Element Research. doi:10.1007/BF02783686.
33. Kohrle, J. (1992). Selenium supply regulates thyroid function, thyroid hormone synthesis and metabolism by altering the expression of the selenoenzymes Type I 5′-deiodinase and glutathione peroxidase. Thyroidology.
34. Lacka, K., et al. (2015). Significance of selenium in thyroid physiology and pathology. Polski Merkuriusz Lekarski.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
**Results may vary.
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