Vitamin A exists in two main types:
1. Preformed Vitamin A (Retinoids)
Preformed vitamin A, also known as retinoids, is found readily available in animal products. This form is directly usable by the body.
- Sources: Meat, fish, poultry, dairy products (milk, cheese, eggs)
2. Provitamin A (Carotenoids)
Provitamin A, also called carotenoids, are found in plants and need to be converted into vitamin A by the body. Beta-carotene is the most common type of provitamin A.
- Sources: Fruits and vegetables, particularly dark leafy greens, orange and yellow fruits and vegetables.
Vitamin A supplements are usually available as retinyl acetate or retinyl palmitate (preformed) or as provitamin A carotenoids (beta-carotene).
The body uses Vitamin A for a variety of functions, including vision, immune function, and cell growth. Both preformed and provitamin A contribute to maintaining sufficient Vitamin A levels. A deficiency can lead to problems like night blindness and impaired immune function.
