Aside from its potent anti-ageing properties, Vitamin C can also give your skin the protection it needs against the suns harmful UV rays. As an antioxidant, Vitamin C creates a barrier to prevent and neutralize free radicals from causing damage to your skin. The vitamin is also essential in the synthesis of two important skin proteins- collagen and elastin. Collagen and elastin are responsible for the structure of your skin. Once these proteins deplete in amount, the structure of your skin changes and it becomes loose and saggy.