Thyrocsin by Thorne

If your TSH, Free T4, or Free T3 are borderline and you’re not on thyroid medication, a thyroid support supplement can help cover common nutrient gaps. It fits dairy-free or low-salt eaters who skip iodized salt, vegans with low iodine and selenium intake, and those with low-normal Zinc or Vitamin B12 on labs. If your TSH is clearly high or symptoms are severe, see a clinician first; nutrients won’t replace prescription hormone.

Iodine and L-tyrosine are the raw materials your thyroid uses to build T4 and T3. Selenium (as selenomethionine) supports deiodinase enzymes, which convert T4 into the active hormone T3. Zinc helps thyroid hormone signaling at the cellular level, while copper participates in hormone synthesis. Ashwagandha can ease stress signaling and has small trials showing modest T3/T4 increases. Vitamins C and E act as antioxidants that protect thyroid tissue from oxidative stress.

The suggested use is two capsules twice daily. Take with food to reduce nausea from zinc. If you use levothyroxine or liothyronine, separate this by at least four hours to avoid absorption issues. Recheck TSH, Free T4, Free T3, and Thyroid Peroxidase Antibodies (TPOAb, the common Hashimoto’s antibody) after 6–12 weeks to gauge effect. If labs improve, many step down to a once-daily maintenance schedule.

Skip added iodine if you have hyperthyroidism, a history of thyroiditis flare with iodine, or multinodular goiter unless your endocrinologist approves. If you’re on antithyroid drugs (methimazole, propylthiouracil), avoid this. With Hashimoto’s, extra iodine can aggravate antibodies in some people; the selenium here helps, but monitor TPOAb. Wilson’s disease or copper overload is a reason to avoid copper-containing blends. Pregnancy: avoid ashwagandha; use a prenatal with iodine instead.