Hashimoto's
Best Magnesium for Thyroid Health
By StopTheFlare Research Team · Updated June 2026
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This is part of our in-depth Hashimoto's guide. We're building out the full, research-backed version of Best Magnesium for Thyroid Health — covering what the studies show, what the community actually reports, and our honest product picks.
In the meantime, start with our complete Hashimoto's supplement protocol, which covers the foundation supplements, what to avoid, and our top-rated products.
What this guide will cover
- The evidence behind the recommendation
- Dosing, forms, and what to look for in a quality product
- Community-reported results and common mistakes
- Our honest top picks — including when to skip a popular product
Recommended products
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.