Vitamin A / Retinol

Fat-soluble vitamin essential for keratinocyte differentiation and skin cell renewal. Its deficiency produces dry, flaky and dull skin through abnormal thickening of the stratum corneum. Its derivatives (retinoids) are used in dermatology to treat severe acne (isotretinoin) and skin ageing (tretinoin). Sources: liver, eggs, whole dairy products, beta-carotene (orange and green vegetables).