Chronic selenium excess causes selenosis — hair and nail loss, GI upset, and nerve symptoms. Learn the safe upper limits and which supplements are most likely to cause selenium overdose.
Chronic selenium excess can cause hair/nail changes, GI upset, and nerve symptoms (selenosis).
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| US (FDA) | 55 mcg | 400 mcg |
| EU (EFSA) | 55 mcg | 400 mcg |
| AU (TGA) | 55 mcg | 400 mcg |
| CN (CNS) | 60 mcg | 400 mcg |
| JP (MHLW) | 65 mcg | 350 mcg |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. Exceeding the UL long-term may cause the toxicity symptoms described above.
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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Not medical advice. Always consult a qualified healthcare professional for personal medical decisions.