Vitamin A + Carotenoids
also known as Vitamin A, Retinol, Beta-carotene, Carotenoids
A fat-soluble vitamin essential for vision, immune function, and skin health. Vitamin A comes in two forms — preformed retinol from animal foods (the active form), and carotenoids from plant foods (which the body converts as needed). The active form has a real toxicity concern at high doses; carotenoids do not.
- Essential for vision — particularly low-light and color vision
- Required for immune function and the integrity of mucous membranes that line the airways and gut
- Supports skin health and cellular renewal
- Required for normal growth and reproductive function
- Beta-carotene and other carotenoids provide antioxidant protection
- Plant carotenoids only convert to active vitamin A as the body needs — built-in safety against toxicity from plant foods
- Found preformed in liver, eggs, and dairy; as carotenoids in orange, yellow, and dark green vegetables
Excess preformed vitamin A (retinol) is genuinely toxic — causes liver damage, bone loss, headaches, and birth defects
Pregnancy: keep total preformed vitamin A from supplements and liver under 10,000 IU per day — high intake causes serious birth defects
Most multivitamins now use beta-carotene rather than retinol to reduce toxicity risk
Beta-carotene supplements (not food sources) increased lung cancer risk in smokers in two large trials — smokers should get carotenoids from food, not pills
Use caution with isotretinoin (Accutane) and other retinoid medications — additive toxicity
Vitamin A is fat-soluble and stored in the liver — toxicity builds over time, not from one large dose
Bear and seal liver have caused acute vitamin A poisoning historically — Arctic explorers and Indigenous communities recognized this
Cod liver oil contains both A and D — supplementing alongside other A or D sources can stack quickly
You might also explore