Common actives include silicones (dimethicone, cyclomethicone), keratin hydrolysates, argan and marula oils, peptides, panthenol, and niacinamide. In the US, hair serums are regulated as cosmetics under the FDA Modernization of Cosmetics Regulation Act (MoCRA), requiring ingredient safety substantiation and proper INCI labeling. EU products need a full Product Information File. A qualified cosmetic chemist connected through AJ Cosmo Labs will handle compliance documentation as part of the formulation scope.
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