itamin a Vitamin A has an anti-aging function thanks to its antioxidant power that fights free radicals. It increases dermal moisture levels and contributes to normal skin function and normal skin cell replication. calcium Calcium is responsible for numerous functions in the body. Vitamin D helps to synthesize enzymes present in the mucous membranes responsible for the active transport of available Calcium. vitamin d In addition to dietary forms, Vitamin D is known as ‘the sunshine vitamin’ as it is produced by the skin through exposure to sunlight. Its production depends on several variables such as SPF use and season, therefore its use is particularly recommended in the winter months or if you have a reduced exposure to the sun. It also addresses autoimmunity