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Thyrocsin, Thyroid Cofactors, 120 Veggie Caps - Thorne Research


Thyrocsin thyroid cofactors enhance T4 hormone levels and support peripheral conversion of T4 to T3.* A Thorne exclusive.

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About Thyrocsin, Thyroid Cofactors, 120 Veggie Caps - Thorne Research

Thyroid hormones regulate the metabolism of proteins, fats, and carbohydrates, thus affecting how these macro-nutrients produce energy. A deficiency or excess of thyroid hormones can have far-reaching effects. For example, a high cortisol level can interfere with thyroid function, resulting in low thyroxine (T4) or poor conversion of T4 to the active form, triiodothyronine (T3). Each thyroid hormone has multiple important functions in the body; for example, T4 supports cardiac output, heart rate, respiratory rate, and basal metabolic rate – a low basal metabolic rate can cause a person to be fatigued, chilly, and have trouble losing weight. Thyrocsin provides nutritional and botanical support for healthy thyroid function, for the conversion of T4 to T3, and for normal cortisol levels. This non-glandular thyroid-support formula is available only from Thorne.

Thorne’s Thyrocsin formula contains key ingredients for thyroid support, including iodine, which is necessary for formation of T4, and L-tyrosine, which is a necessary component of both T4 and T3 formation. Animal studies have indicated that the Ayurvedic botanical, ashwagandha, can increase T4 concentrations. Thyrocsin also includes several nutrient cofactors necessary for converting T4 to T3, including the minerals selenium, zinc, and copper. Thyrocsin includes vitamin B12 because a deficiency of this vitamin appears to interfere with the activity of thyroid hormones. Conversion of T4 to T3 can be inhibited by heavy metal toxicity and lipid peroxidation; hence, the inclusion of antioxidant vitamins C and E to counterbalance this inhibition.


Allergen Information


120 Capsules


Ashwagandha, Copper, Iodine, Selenium, Tyrosine, Vitamin B, Vitamin C, Vitamin E, Zinc


Take 2 capsules two times daily or as recommended by your health professional.

Nutrition Format




Storage Instructions

Store in a cool, dark place out of reach of children


Food supplements should not be used as a substitute for a varied diet. If you are taking prescribed medication, have any medical condition or are pregnant or breast-feeding please consult your healthcare practitioner before taking food supplements.

Supplement Facts
Serving Size: 2 Capsules

Servings Per Container: 60

Amount Per Serving%Daily Value
Ashwagandha Extract (Withania somnifera)90 mg
Copper (Citrate)500 mcg
Iodine (Potassium Iodide)225 mcg
L-Tyrosine500 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)5 mg
Daily value not established

Other Ingredients: Hypromellose Capsule, Leucine, Silicon Dioxide