Vitamin E, as we may know it, refers to alpha-Tocopherol, which is the most active of a group of 8 fat-soluble compounds (4 Tocopherols and 4 Tocotrienols). It is, together with vitamin C and beta carotene, a powerful antioxidant that protects against cellular damage.
Vitamin D is now known as a prohormone, comprising a group of seco-sterols with similar hormone-like functions. The most crucial role vitamin D plays in the body is to maintain the homeostasis of calcium, magnesium and phosphate, playing an essential role in the microelements’ metabolism.
Vitamin C or L-ascorbic acid is a water-soluble vitamin. It is an essential vitamin because, unlike most animals, humans can’t synthesise it endogenously. The intake must be made from foods where it is naturally present or from dietary supplements.