A life saviour, it fends off the common cold, as well as illuminating and toning the complexion with additional antioxidant benefits. Less commonly known, it is also the most important vitamin involved in the synthesis of collagen; so when thinking vitamin C don’t think immediate radiance alone, think also long term firmness.
We like to use this vitamin as a more complex molecule combining L-ascorbic acid and sodium ascorbyl phosphate in a high concentration to obtain a more stable form that breaks down slower when exposed to air. Even so, keep in mind that vitamin C is not an ingredient to use now and then, extending the use-up rate of the product endlessly after opening. Fresh is best.