Which vitamin C form is most stable for a private label serum?

Tetrahexyldecyl ascorbate (THD) and magnesium ascorbyl phosphate (MAP) are far more stable than pure L-ascorbic acid, which oxidizes quickly. THD is oil-soluble and premium; MAP is water-stable and gentle. Specify the form and percentage in your brief on the AJ Cosmo Labs app so your cosmetic chemist formulates for the shelf-life and skin tolerance you need.