Vitamin A has a big reputation: "good for your eyes," "good for your skin," "good for immunity." All three have a real basis, but the details matter, including the difference between getting enough and getting too much.
Written by Vita Globe Editorial Team | Reviewed against the NIH Office of Dietary Supplements fact sheet and randomized trials
What are the benefits of vitamin A?
Vitamin A is needed to make rhodopsin, the pigment that lets your eyes see in dim light, and it's involved in immune function, cell growth and the maintenance of organs and tissues[1]. Adults need 700–900 mcg RAE a day, and most people in the U.S. get enough from food[1].
Caveat: The benefits come from getting enough. Extra preformed vitamin A beyond the 3,000 mcg RAE upper limit can cause harm[1].
Sources: NIH ODS Vitamin A · AREDS · Verified 2026-09-28
IN THIS ARTICLE
What forms of vitamin A are there?
You get vitamin A in two ways[1]:
- Preformed vitamin A (retinol and retinyl esters such as retinyl acetate or palmitate) from animal foods like liver, fish, eggs and dairy, and from many supplements.
- Provitamin A carotenoids, mainly beta-carotene, from orange, yellow and dark green plants like sweet potatoes, carrots and spinach. Your body converts these to vitamin A as needed.
That distinction matters for safety. The upper limit applies to preformed vitamin A, not beta-carotene. On the other hand, high-dose beta-carotene supplements carry their own risks for smokers (more below)[1].
How does vitamin A support your eyes?
Vitamin A is a building block of rhodopsin, the light-sensitive pigment in the retina. When vitamin A runs low, the first sign is typically night blindness, or trouble seeing in low light. Severe deficiency can lead to xerophthalmia, a serious eye condition that remains a problem in some lower-income countries[1].
In the U.S., frank vitamin A deficiency is rare[1], so for most people, extra vitamin A won't sharpen already-normal vision.
The most-cited eye research is the Age-Related Eye Disease Study. In people at high risk of advanced age-related macular degeneration (AMD), a high-dose formula including vitamins C and E, beta-carotene and zinc reduced the risk of progression by about 25%[2]. In the follow-up AREDS2 trial, researchers tested lutein and zeaxanthin as a substitute for beta-carotene, and the updated formula no longer requires beta-carotene[3][1]. That matters because high-dose beta-carotene raises lung cancer risk in smokers (see below). Those findings apply to people who already have intermediate or advanced AMD, not to healthy eyes.
What does vitamin A do for skin?
Vitamin A is involved in cell growth and differentiation, which is how tissues like skin and the linings of your body renew and maintain themselves[1]. That's the biological basis for the "good for skin" reputation.
It's worth separating that from retinoid skincare. Prescription retinoids and many cosmetic retinol creams are applied to the skin or used as medications at specific doses; the results of those products don't mean that taking more vitamin A by mouth will give you similar effects. In fact, people using oral retinoid medications should avoid vitamin A supplements unless their doctor says otherwise, because the combination can raise the risk of vitamin A toxicity[1].
One harmless skin effect to know about: eating or taking a lot of beta-carotene over time can turn skin yellow-orange, a condition called carotenodermia[1].
Interested in other skin nutrients? See Vitamin E Benefits for Skin.
How does vitamin A relate to immunity?
Vitamin A is involved in immune function, and it supports the normal formation and maintenance of tissues and organs throughout the body[1]. Deficiency weakens immune defenses, which is why vitamin A deficiency is a major public health concern for young children in low-income countries[1].
For people who already get enough, there's no strong evidence that extra vitamin A provides added immune protection. For a wider look at immune nutrients, see Vitamin C, Zinc, and Vitamin D for Colds.
How much vitamin A do you need?
| Group | RDA (mcg RAE/day) |
|---|---|
| Adult men | 900 |
| Adult women | 700 |
| Pregnancy | 770 |
| Lactation | 1,300 |
Source: NIH ODS[1]. U.S. adults average roughly 616–682 mcg RAE a day from food, and deficiency is uncommon[1].
Safety: The adult upper limit is 3,000 mcg RAE of preformed vitamin A per day, and people who are or may become pregnant should avoid exceeding it because of the risk of birth defects[1]. If you smoke or have been exposed to asbestos, avoid high-dose beta-carotene supplements: in the ATBC and CARET trials, beta-carotene increased lung cancer risk in these groups[4][5]. Full details are in How Much Vitamin A Is Too Much?
The honest summary
- Vitamin A is essential for low-light vision, immune function and cell growth.
- Most people in the U.S. get enough from food; deficiency is rare.
- More isn't better: respect the 3,000 mcg RAE preformed limit, and smokers should avoid high-dose beta-carotene.
Our option
Vita Globe Superfood Gummies with Vitamins A, C, E & Zinc
Our superfood gummies include vitamin A alongside vitamins C and E, zinc and açaí, acerola and gooseberry extracts, in a 2-gummy daily serving. See the Supplement Facts panel on the product page for the vitamin A amount and form, and count it toward your daily total if you take other supplements.*
Frequently asked questions
What does vitamin A do for the body?
It supports low-light vision, immune function, cell growth and communication, reproduction and the development of organs such as the heart and lungs[1].
Does vitamin A improve eyesight?
It corrects night blindness caused by deficiency. It won't improve normal vision or replace glasses[1].
Is it OK to take vitamin A every day?
At or near the RDA, yes for most adults. Stay under 3,000 mcg RAE of preformed vitamin A from all sources, and talk to your provider if you're pregnant or take retinoid medications[1].
What foods are highest in vitamin A?
Beef liver is the richest source of preformed vitamin A; sweet potatoes, spinach and carrots are top sources of beta-carotene[1].
Sources
- NIH Office of Dietary Supplements. Vitamin A and Carotenoids: Fact Sheet for Health Professionals. Updated March 10, 2025. ods.od.nih.gov
- Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001;119(10):1417-1436. doi:10.1001/archopht.119.10.1417
- Age-Related Eye Disease Study 2 Research Group. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the Age-Related Eye Disease Study 2 (AREDS2) randomized clinical trial. JAMA. 2013;309(19):2005-2015. doi:10.1001/jama.2013.4997
- The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. The effect of vitamin E and beta carotene on the incidence of lung cancer and other cancers in male smokers. N Engl J Med. 1994;330(15):1029-1035. doi:10.1056/NEJM199404143301501
- Omenn GS, Goodman GE, Thornquist MD, et al. Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. N Engl J Med. 1996;334(18):1150-1155. doi:10.1056/NEJM199605023341802
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
