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Thyrocsin by Thorne provides a comprehensive blend of nutrients and botanicals for supporting healthy thyroid function.


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Thyrocsin by Thorne provides vegetarian thyroid cofactors that support healthy metabolism.

Ingredient Information

Key Ingredients

Ingredient Amounts

Serving Size: 2 Capsules
Servings Per Container: 60
Name Amount
Ashwagandha Extract (Withania somnifera) 90 mg
Copper (Citrate) 500 mcg
Iodine (Potassium Iodide) 225 mcg
L-Tyrosine 500 mg
Selenium (Selenomethionine) 100 mcg
Vitamin B12 (Methylcobalamin) 100 mcg
Vitamin C (Ascorbic Acid) 200 mg
Vitamin E (d-Alpha-Tocopheryl) 67 mg
Zinc (Bisglycinate Chelate) 5 mg
Other Ingredients: Hypromellose Capsule, Leucine, Silicon Dioxide

How to Use

Take 2 capsules two times daily or as recommended by one of our health coach professionals.

Is Thyrocsin™ right for you?

Related test Thyroid Test
Find the why behind the way you feel

Thyroid imbalance is more common than you might think. This at-home blood test provides insights about thyroid function by measuring key hormone levels. Results include a personalized health plan.

Thyrocsin™ Details

An underactive thyroid produces less than optimal levels of thyroid hormones, which are necessary for healthy metabolic function and weight management. The consequence is an overall slowing of metabolic rate.

Common signs of sluggish thyroid metabolism can include:

  • Tiredness; getting fatigued easily
  • Mental fogginess; difficulty concentrating
  • Gaining weight easily or having difficulty losing weight
  • Constipation
  • Dry skin, hair, and nails
  • Sensitivity to cold; cold hands and feet
  • Heavy menses; low sex drive

Benefits of Thyrocsin

  • Enhances energetic feelings and balanced mood
  • Supports healthy hair, skin, and nails
  • Contributes to mental clarity
  • Promotes bowel regularity
  • Provides nutrient support for individuals taking a thyroid medication
  • Indirectly benefits healthy adrenal gland function by supporting a balanced cortisol level

Specific Ingredient Benefits and Features

  • Iodine and tyrosine are necessary for the formation of thyroid hormones
  • Iodine, tyrosine, and ashwagandha support a healthy level of T4
  • Nutrient co-factors selenium, zinc, and copper promote the conversion of T4 to T3
  • Contains vitamin B12 because a B12 deficiency can interfere with thyroid function
  • Antioxidant vitamins C and E protect the thyroid gland from oxidative stress
  • Contains no animal glandular ingredients or hormones
  • Features well-researched KSM-66® ashwagandha
  • Vitamin B12 in its most active form – methylcobalamin
  • Features zinc and copper as glycinate chelates for enhanced absorption


Allergy Warning

This product is contraindicated in an individual with a history of hypersensitivity to any of its ingredients. Iodine may occasionally cause an allergic reaction in some individuals.

Pregnancy Warning

If pregnant, nursing, or trying to conceive, do not use this product.


Tyrosine is contraindicated in individuals taking an MAO inhibitor antidepressant medication.



Our Mission

We believe personalized, scientific wellness can extend the duration of one's health span, create happier and healthier lives, and feel one’s best at every age and life stage. Our ambition is to empower individuals to live healthier for longer through personalized, scientific testing and solutions. With a deep portfolio of personalized offerings – testing that provides individualized data, educational resources, and products that support specific health goals and needs – Thorne is here at every age and life stage. Thorne is redefining what it means to live healthier for longer.

How we know our supplements work

At Thorne, being able to rely on the safety and efficacy of our nutritional supplement products is the motivating force behind our clinical trials program. Our confidence that each product we formulate and manufacture works in the body comes from extensive clinical research and medical literature that substantiate the presence of each ingredient in each formula. In addition to confirming the safety of our products, clinical research helps us better understand their efficacy. And it paves the way for new discoveries. The ultimate goal of our research partnerships is to help us fulfill our mission of solving the biggest challenges in health and wellness.
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