Supplement Reviews
Every product we cover, researched and rated independently. We only feature products we would stand behind — and we'll tell you when to skip a popular one.
Thorne Selenium (Selenomethionine)
Thorne
The most evidence-backed product on this list — 200 mcg selenomethionine is the exact form shown to lower TPO antibodies in randomized trials.
Pure Encapsulations Selenium (Selenomethionine)
Pure Encapsulations
Essentially the same clinical-grade selenomethionine as Thorne at a lower price — best value in the most critical Hashimoto's category.
Wholesome Story Myo-Inositol & D-Chiro Inositol
Wholesome Story
Pairing myo-inositol with selenium reduces TSH and thyroglobulin antibodies better than selenium alone — the most-reviewed inositol blend on Amazon.
Nordic Naturals Ultimate Omega
Nordic Naturals
The most-reviewed triglyceride-form fish oil on Amazon (4.7★, 24k+ ratings) — the benchmark anti-inflammatory omega-3 across all five conditions.
Thorne Vitamin D + K2 Liquid
Thorne
Flexible metered-drop liquid D3/K2 from a third-party certified brand — vitamin D deficiency correlates strongly with higher thyroid antibodies and worse skin.
Life Extension Vitamins D and K with Sea-Iodine
Life Extension
Convenient high-dose D/K combo — note it contains 1,000 mcg iodine which is unsuitable for most Hashimoto's patients; only use if your doctor confirmed low iodine.
Pure Encapsulations Magnesium Glycinate
Pure Encapsulations
The cleanest, best-tolerated magnesium glycinate available — 4.6★ from 2,700+ verified reviews, named best overall by multiple expert roundups.
Thorne Zinc Picolinate
Thorne
Picolinate is the best-absorbed zinc form — a required cofactor for T4→T3 conversion and skin barrier repair, from a third-party certified brand.
Thorne Iron Bisglycinate
Thorne
Bisglycinate (Ferrochel) corrects low ferritin without the GI misery of ferrous sulfate — NSF Certified for Sport. Test ferritin before supplementing.
Pure Encapsulations Methylcobalamin B12
Pure Encapsulations
Active methylcobalamin B12 in the ready-to-use form — B12 deficiency frequently co-occurs with Hashimoto's and compounds fatigue and brain fog.