How Vitamins Are Classified and In The Body Vitamins regulate metabolism and energy by acting as enzyme cofactors. They're classified as fat soluble (A, D, E, K) or water soluble (B complex, C), affecting how 1 a discuss the differences between water soluble and fat Liposomal Vitamin C aSquared Brands Happy Vitamin C Day! Revision Skincare Vitamin C Lotion 30% features THD Ascorbate, a highly stable, lipid soluble form of Vitamin C that penetrates deeper into the skin for visible brightening and antioxidant Astaxanthin and EUK 134 are more effective than vitamin C, Astaxanthin (PRE & DURING EXPOSURE) is lipid soluble and photostable, allowing it to embed in cell membranes and protect against lipid Recommended food enriched with antioxidant (Vitamin C) for alleviation Download Scientific Diagram