Best Supplements for Increased Serum Free Thyroxine Levels
Ranked by research evidence. Compare 10 supplements across 12 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence3 studies
Across 3 studies on selenium supplementation for increased serum free thyroxine levels, 2 reported beneficial small-sized effects and 1 reported a neutral effect. The evidence primarily comes from clinical populations with Hashimoto thyroiditis or Graves-Basedow disease, with a median study duration of 84 days (12 weeks), indicating effects may be observed at this timeframe. Selenium shows moderate evidence for a small beneficial effect on thyroid function in these clinical populations.
10 supplements
- LowSeleniumAcross 3 studies on selenium supplementation for increased serum free thyroxine levels, 2 reported beneficial small-sized effects and 1 reported a neutral effect. The evidence primarily comes from clinical populations with Hashimoto thyroiditis or Graves-Basedow disease, with a median study duration of 84 days (12 weeks), indicating effects may be observed at this timeframe. Selenium shows moderate evidence for a small beneficial effect on thyroid function in these clinical populations.2 beneficial1 neutral3 studies