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Many active ingredients like vitamin C or retinoids are pH sensitive so maintaining their happy pH range matters

This may reduce the chances of conception

The cytotoxicity of both compounds increased significantly in biotin-free DMEM, with IC 50 values lower than those determined in biotin-rich RPMI 1640

Vitamin B12 is an essential water-soluble nutrient, also known as cobalamin

While synergism and additivity allow for achieving better effects with lower drug concentrations, clinical data suggest that independent drug action can also significantly improve patient outcomes (69)

Its a complete disaster for any serious researcher