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Thorne Research - Thyrocsin™

Thorne Research - Thyrocsin™

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Helps enhance production and conversion of T4.
Thorne Thyrocsin

Thorne Research - Thyrocsin™ - 120 Capsules

Thorne Thyrocsin

Thorne Research - Thyrocsin™ - 60 Capsules


Thorne Research Thyrocsin™

Nutritional Support for Thyroid Function

Optimizes Metabolism 

Thorne Research Thyrocsin™ is a supplement that supplies nutritional support for a healthy thyroid gland.

The hormones thyroxine (T4) and triiodothyronine (T3) are produced by the thyroid gland. These hormones are essential to the proper development of cells in the body. Thyroid hormones regulate the metabolism of proteins, fats, and carbohydrates, affecting how these compounds produce energy. Individual thyroid hormones have important functions in the body; for example, T4 supports cardiac output, heart rate, respiratory rate, and basal metabolic rate (BMR). A low BMR may cause one to be fatigued, chilly, and have trouble losing weight.

Thyrocsin provides supportive nutrients for a healthy thyroid gland. Not only does Thyrocsin support healthy thyroid function, it also provides nutrients necessary for conversion of T4 to T3 in the tissues outside the thyroid gland.


Nutritional support for thyroid function.


  • Contains nutrients and botanicals that enhance T4 production
  • Provides key nutrients for peripheral conversion of T4 to T3
  • Helps optimize metabolism
  • Unique, non-glandular formulation available only from Thorne Research

Iodine is necessary for formation of T4, while L-tyrosine is a necessary component of both T4 and T3 formation. Animal studies indicate the Ayurvedic botanical ashwagandha can increase T4 concentrations. Several nutrients are also necessary for conversion of T4 to T3, including the minerals selenium, zinc, and copper. Thyrocsin contains vitamin B12 because its insufficiency appears to interfere with the activity of thyroid hormones. Conversion of T4 to T3 can be inhibited by heavy metal toxicity and lipid peroxidation; the antioxidant vitamins C and E can counterbalance this inhibition.

Thyroid hormones are involved with metabolism throughout the body. Thus, a deficiency or excess of thyroid hormones can have far-reaching effects. High cortisol levels can interfere with thyroid function, resulting in low T4 or poor conversion of T4 to the active form, T3. Nutrients that support normal levels of cortisol may be of benefit for this population.

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Additional Information
SKU Thorne-Research-SF784-4012-Grouped

Suggested Use: Take 2 capsules two times daily or as recommended by a health-care practitioner.

Supplement Facts
Serving Size: 2 Capsules
Amount Per Serving %DV1
Vitamin C (as Ascorbic Acid) 200 mg 333%
Vitamin E (as d-Alpha Tocopheryl) 100 IU 333%
Vitamin B12 (as Methylcobalamin) 100 mcg 1,667%
Iodine (as Potassium Iodide) 225 mcg 150%
Zinc (as Zinc Picolinate) 5 mg 33%
Selenium (as Selenomethionine) 100 mcg 143%
Copper (as Copper Picolinate) 500 mcg 25%
L-Tyrosine 500 mg *
Ashwagandha extract (root) (Withania somnifera) 150 mg *
*Daily Value (DV) not established.

Other Ingredients: Hypromellose (derived from cellulose) capsule, leucine, silicon dioxide.