Is 10% Niacinamide Better Than 5%? What the Trials Actually Tested
Every human trial behind niacinamide's reputation used 2%, 4% or 5% — and Korean law stops the whitening claim at 5%. A look at what the shelf is actually selling you.
Every human trial behind niacinamide's reputation used 2%, 4% or 5% — and Korean law stops the whitening claim at 5%. A look at what the shelf is actually selling you.