Selenium excess is a top cause of supplement-related hair loss. UL is 400 mcg/day. Brittle nails and garlic breath are warning signs. Check your dose.
Chronic selenium excess can cause hair/nail changes, GI upset, and nerve symptoms (selenosis).
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| United States | 55 mcg | 400 mcg |
| European Union | 55 mcg | 400 mcg |
| Australia | 55 mcg | 400 mcg |
| China | 60 mcg | 400 mcg |
| Japan | 65 mcg | 350 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. “Not established” does not mean unlimited intake is safe.
Yes. Chronic selenium excess (selenosis) is one of the most common causes of supplement-related hair loss. Other signs include brittle nails, GI upset, and a garlic-like breath odor. The UL is 400 mcg/day.
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