There is not enough scientific research and theory to prove that too much niacinamide can cause hair growth.
Niacinamide has the effect of promoting capillary microcirculation. The reason why there is a “hair growing after use” statement may be because:
After using niacinamide-containing whitening products, the skin tone is brightened, the color of the hair and the color difference of the skin become larger, and the hair becomes more conspicuous;
The hair that was originally hidden in the hair follicle to grow will grow faster after receiving nutrients and improving the microcirculation of the surrounding hair follicle.
Overall, there is currently no clear evidence that niacinamide causes additional fine hair growth.
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