Ingredient guide
Vitamin A is an essential vitamin for vision, immunity, and skin. The strong evidence is for correcting a shortfall. The crucial safety point is that preformed vitamin A is stored in the body and toxic in excess, so the upper limit matters, especially in pregnancy.
Moderate evidenceVitamin A is a fat-soluble vitamin that comes in two main forms. Preformed vitamin A, or retinol, is found in animal foods such as liver, eggs, and dairy. Provitamin A carotenoids, such as beta-carotene, come from colourful plants and are converted by the body into vitamin A only as needed, which makes them safer at high intakes.
Vitamin A plays several essential roles. It is part of the pigment in the eye that lets you see in dim light, which is why night vision suffers first in a shortfall. It also supports the immune system and helps maintain the skin and the surface linings of the body. Because it is fat soluble, the body stores it, mostly in the liver.
The clearest evidence is the nutrition basics. A genuine vitamin A shortfall causes serious harm, including vision loss and weakened immunity, and remains a major public health issue in parts of the world. Correcting it resolves these problems. For well-nourished people, the everyday need is easily met by food.
The defining feature of vitamin A is its narrow safety margin. Because preformed vitamin A is stored, too much over time becomes toxic, causing headaches, liver stress, weaker bones, and, importantly, birth differences if taken in high doses during pregnancy. We grade the evidence as moderate, with a clear deficiency story and an equally clear ceiling you must respect.
Most people in well-fed countries get enough vitamin A from food and do not need a supplement. If you do take one, beta-carotene is a safer source because the body converts it only as needed. Keep preformed vitamin A under 3,000 mcg per day from all sources, and avoid high-dose retinol completely in pregnancy unless a healthcare provider directs otherwise.
The adult recommended intake is about 700 mcg to 900 mcg per day, usually met by a varied diet. The upper limit for preformed vitamin A is 3,000 mcg per day for adults. Higher amounts are stored and can be toxic. Ask your healthcare provider before supplementing, and avoid high-dose retinol entirely in pregnancy.
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High doses of preformed retinol can harm a developing baby, so they must be avoided in pregnancy. Beta-carotene from food is considered safe. Check with a provider.
Retinol is preformed vitamin A from animal foods and can build up to toxic levels. Beta-carotene from plants is converted only as needed, making it a safer source.
Most people in well-fed countries do not, since a varied diet supplies enough. A shortfall is mainly a concern in regions with limited food variety.