Vitamin A, a fat-soluble nutrient, is essential for skin health, immune function, and cellular turnover, but must be consumed in balanced amounts to avoid toxicity.
Key facts
- •Vitamin A is a fat-soluble vitamin that supports skin, hair, and nail health by regulating sebum production and cell turnover.
- •The human body does not produce vitamin A, requiring it to be obtained through diet or topical application.
- •Adult males are advised to consume 900 micrograms of vitamin A daily, while adult women are advised to consume 700 micrograms.
- •Excessive vitamin A intake can cause hypervitaminosis A, which may result in hair loss and skin barrier disruption.
- •Retinol is a derivative of vitamin A that is converted into retinoic acid when applied to the skin.
Vitamin A is a critical nutrient for skin health, supporting cellular turnover, acne reduction, and the reversal of sun damage. While often used topically in skincare as retinol, the body also requires dietary vitamin A to maintain healthy immune and reproductive systems. Because the human body cannot produce vitamin A, it must be obtained through external sources like diet and skincare products.
By the numbers
Forms and Functions of Vitamin A
Vitamin A exists in two primary forms in food: retinol, which originates from animal products, and carotenoids, which are derived from plants and converted into vitamin A during digestion. When applied topically, retinol is converted into retinoic acid, the body's active form of the vitamin. Beyond skin benefits, vitamin A is necessary for the synthesis of keratin, a structural protein essential for hair and nail health, and it helps regulate sebum production.
Dietary Requirements and Safety
Daily requirements for vitamin A vary based on factors such as age, sex, and pregnancy status. According to the Mayo Clinic, the recommended daily intake is 900 micrograms for adult males and 700 micrograms for adult women. Maintaining a regular, balanced intake is necessary to prevent deficiencies, but experts warn against excessive consumption. Consuming too much vitamin A can lead to hypervitaminosis A, a toxic condition that may cause hair loss and damage the skin barrier.
Advertisement
This article was independently rewritten by ManyPress editorial AI from reporting originally published by Vogue.
