NIH says biotin deficiency in a healthy adult has never been reported, yet high-dose biotin supplements can distort blood tests badly enough to mask a heart attack.
Skin & Body Care
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Salicylic Acid for Acne: What the FDA Monograph Says, and Why a Face Wash Isn't Enough
Salicylic acid is FDA Category I for acne at 0.5-2% and oil-soluble, so it reaches inside clogged pores. But a face wash is rinsed off in seconds. -
Colloidal Oatmeal for Eczema-Prone Skin: What the FDA Monograph Actually Says
Colloidal oatmeal is an FDA-recognised skin protectant, and the monograph minimum is just 0.007%. What it does for eczema-prone skin, and how to read a label properly.