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Most measured niacinamide benefit occurs between 2% and 5%.
Niacinamide appears near the top of this ingredient list, which usually indicates a concentration in the 5-10% range. Most of the measured benefit for barrier support and tone shows up around 2-5%; higher percentages have not been shown to work proportionally better and are more likely to cause flushing in people who are sensitive to it.
Dermasift analyses skincare formulations against published cosmetic science. This is information, not medical advice — for a diagnosed skin condition, speak to a dermatologist.