beta-carotene

botanicalbeta-carotene

Best with a mealTake with food

What is it

Beta-carotene is the orange pigment found in carrots, sweet potatoes, and many other fruits and vegetables. It is a provitamin A carotenoid that the body converts to retinol as needed.

How it works

Beta-carotene is absorbed in the small intestine alongside dietary fat and converted in the intestinal wall to retinol, the form of vitamin A the body uses. Conversion is tightly regulated — when vitamin A status is high, less beta-carotene is converted, so dietary beta-carotene does not cause vitamin A toxicity. Unconverted beta-carotene also circulates in the blood and accumulates in tissues, where it acts as an antioxidant and protects against ultraviolet damage in skin. Two molecules of retinol are theoretically produced from one molecule of beta-carotene, but actual conversion is much less efficient in practice (around 12 mcg of dietary beta-carotene yields 1 mcg of retinol).

Evidence for 6 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Source of vitamin A

Grade A

Strong evidence

Beta-carotene serves as a safe dietary precursor to vitamin A, especially important for vegetarians and vegans.

Antioxidant status

Grade B

Good evidence

Beta-carotene contributes to antioxidant capacity in blood and tissues. Higher dietary intake correlates with lower oxidative stress markers.

Age-related macular degeneration (AREDS)

Grade B

Good evidence

Beta-carotene was part of the original AREDS eye-vitamin formula but was replaced in AREDS 2 with lutein/zeaxanthin due to the lung cancer concern in smokers.

Photoprotection (sunburn prevention)

Grade C

Moderate evidence

Long-term supplementation has shown modest reduction in sunburn susceptibility, but the effect is small and not a replacement for sunscreen.

Cancer prevention (general population)

Grade D

Mixed evidence

Despite hopes from observational studies, supplement trials have not shown reduced cancer risk. In smokers, high-dose supplements increased lung cancer risk.

Cardiovascular disease prevention

Grade D

Mixed evidence

Supplement trials have not shown cardiovascular benefit; some suggested possible harm in smokers.

2 commercial forms

Natural beta-carotene (from algae or palm)

mix of carotenoid isomers

Derived from D. salina algae or palm fruit, contains a mix of natural carotenoid isomers. Often preferred over synthetic for general use.

Synthetic beta-carotene

single isomer, used in major trials

Pure all-trans beta-carotene. This was the form used in the CARET and ATBC trials that found harm in smokers — whether natural mixed-carotenoid forms have the same risk is debated.

Dosage

The vitamin A RDA can be met through beta-carotene from food. As a supplement, doses commonly range from 3 mg (about 5,000 IU) to 25 mg. No upper limit has been set for beta-carotene from food, but supplemental high doses (above 20 mg per day) should be avoided by smokers and former heavy smokers.

When and how to take it

Beta-carotene is fat-soluble and absorption depends heavily on dietary fat — even a small amount of oil with a carrot salad dramatically improves absorption. Take supplements with a meal containing fat. Time of day does not matter.

Food sources

Food	Amount	%DV
Sweet potato (baked, with skin)	16,800 mcg	—
Carrots (raw), 1/2 cup	5,051 mcg	—
Spinach (boiled), 1/2 cup	5,800 mcg	—
Kale (cooked), 1/2 cup	5,884 mcg	—
Butternut squash (cooked), 1/2 cup	5,725 mcg	—
Cantaloupe, 1/2 cup	1,624 mcg	—
Red bell pepper, 1/2 cup raw	1,191 mcg	—
Mango, 1 fruit	1,062 mcg	—

Safety

Beta-carotene from food is very safe. The major safety concern is supplemental high-dose beta-carotene in current and former smokers. Two large trials (CARET, ATBC) found that 20 to 30 mg per day of beta-carotene supplements increased lung cancer risk in smokers and people exposed to asbestos. Non-smokers do not appear to face this risk. High dietary intake (eating lots of carrots, sweet potatoes, etc.) can cause carotenoderma — a harmless yellow-orange tint to the skin, especially on palms and soles. This is cosmetic and resolves when intake decreases.

Who should be cautious

Smokers and former smokers should avoid high-dose beta-carotene supplements. People with hypothyroidism may convert beta-carotene to vitamin A less efficiently and could experience carotenemia from high intake. Pregnant women can safely consume beta-carotene from food.

Interactions

Orlistat reduces beta-carotene absorption. Statins and certain cholesterol-lowering drugs may modestly reduce blood carotenoid levels. Beta-carotene supplements may reduce the protective HDL effect of statins plus niacin in some trials, though clinical importance is uncertain.

Frequently asked questions

Why is beta-carotene risky for smokers?⌄

Two large trials (CARET, ATBC) showed that high-dose supplements (20+ mg/day) increased lung cancer risk in smokers and asbestos workers. Food-source beta-carotene does not appear to have this effect.

Can I take beta-carotene safely as a non-smoker?⌄

Yes. Non-smokers do not show the lung cancer risk found in smokers. Typical multivitamin doses are safe.

Does eating too many carrots turn skin orange?⌄

Yes, this is called carotenoderma. It is harmless and reverses when intake drops. Common in young children who eat lots of orange vegetables.

Is beta-carotene the same as vitamin A?⌄

No. Beta-carotene is a precursor that the body converts to vitamin A as needed. This regulated conversion makes beta-carotene from food much safer than preformed retinol.

Should I take beta-carotene with food?⌄

Yes, with a meal containing some fat. Absorption is poor without dietary fat.

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.