Biotin vs Selenium
Evidence-based comparison of Biotin and Selenium — absorption, dosage, safety, and which is best for your needs.
Selenium
Thyroid support: Supports thyroid hormone production and conversion; Immune modulation: Regulates innate and adaptive im
Full GuideDetailed Comparison
| Biotin | Selenium | |
|---|---|---|
| Category | Vitamin | Mineral |
| Mechanism | Hair support: Supports hair follicle growth and nutrient delivery | Thyroid support: Supports thyroid hormone production and conversion; Immune modulation: Regulates innate and adaptive im |
| Safety | Biotin has not been shown to cause any harm. However, supplements that contain biotin above recommended amounts may cause false results in some lab te | Yes, if you get too much selenium over time. Brazil nuts, for example, contain very high amounts of selenium (68–91 mcg per nut) and can cause you t |
Which Should You Choose?
Biotin may be better if: Hair support: Supports hair follicle growth and nutrient delivery
Selenium may be better if: Thyroid support: Supports thyroid hormone production and conversion; Immune modulation: Regulates innate and adaptive immune responses; Antioxidant ac