Vitamin D is important for skin health as it plays a role in many skin diseases. The main source of vitamin D is sunlight, but it can also be obtained through diet. Vitamin D deficiency is often associated with various skin problems such as psoriasis, atopic dermatitis, vitiligo, acne and skin cancer. Vitamin D helps to regulate the immune system and reduce inflammation, so supplementation can have a positive effect on the course of inflammatory skin conditions such as atopic dermatitis and acne. Studies have also shown that vitamin D can reduce the risk of skin cancer by influencing signalling pathways associated with carcinogenesis. Vitamin D analogues are also effective in the topical treatment of certain conditions, namely psoriasis, vitiligo and dermal fibrosis, by affecting cell proliferation and differentiation, stimulating melanocyte renewal and reducing inflammation. A comprehensive understanding of the action of vitamin D could contribute to the development of new therapeutic approaches for the treatment of skin diseases.

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