Provitamin A (plant precursor of retinol)
ATC code: A11CA02 (Beta-carotene (provitamin A))
Brand names
Beta-carotene, Lumitene
Beta-carotene is the most studied carotenoid. In the small intestine β,β-carotene-15,15-monooxygenase cleaves each molecule into 2 retinol molecules. Conversion is feedback-regulated: with sufficient vitamin A stores, the body reduces conversion, so hypervitaminosis A from beta-carotene is essentially absent. In high doses beta-carotene itself shows pro-oxidant activity in oxygen-rich environments (smoker lung), explaining increased lung cancer risk in CARET and ATBC.
First line
Beta-carotene is used as a safe retinol alternative for vitamin A deficiency in pregnant women (high-dose retinol is teratogenic), patients with severe malabsorption (coeliac, cystic fibrosis, Crohn, post-bariatric) and people on diets low in animal products. 2011 recommends retinol as first choice in severe paediatric deficiency in developing countries; beta-carotene is an additional option in pregnancy and individual retinol intolerance.
First line
Beta-carotene corrects night blindness and early conjunctival xerosis in vitamin A deficiency. In Spain xerophthalmia occurs in patients with severe malabsorption; AEMPS registers Carotaben (50 mg capsules) mainly for erythropoietic protoporphyria but it is used off-label in deficiency. In severe paediatric xerophthalmia 2011 recommends retinol parenterally or orally (200 000 IU) repeated at day 1 and week 2 – beta-carotene is unsuitable for the acute stage due to slow conversion. After the acute phase maintenance beta-carotene 15-30 mg/day.
The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.
Not recommended
Beta-carotene was marketed for decades as a «natural antioxidant» for cancer prevention. The ATBC trial (Finland, 1994, NEJM) in 29 133 smokers: beta-carotene 20 mg/day raised lung cancer incidence by 18% vs placebo. The CARET trial (USA, 1996, NEJM) in 18 314 smokers and asbestos workers was stopped early due to 28% higher lung cancer incidence and 17% higher all-cause mortality. Cochrane 2012 on antioxidants confirmed: beta-carotene increases all-cause mortality in non-deficient people. 2021 and SEA do not recommend antioxidant complexes for prevention. In smokers and former smokers beta-carotene >5 mg/day is contraindicated. If beta-carotene was recommended «for cancer prevention», consider seeking a second opinion.
Sources
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FDA Category A at physiological doses. Advantage over retinol: beta-carotene does not cause hypervitaminosis A and is not teratogenic, so it is the form used in pregnancy when needed. High doses (>30 mg/day) in pregnancy are not studied and not recommended.
Compatible (Hale L1). Beta-carotene enters milk and gives colostrum its yellowish tint – this is normal. Daily intake during lactation 1300 μg RAE (about 8 mg beta-carotene).
Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.
Beta-carotene is evaluated for the following indications with varying evidence strength: Vitamin A deficiency (evidence tier A), Xerophthalmia (vitamin A deficiency with eye involvement) (evidence tier A), Cancer prevention through supplements (evidence tier F). See the full indication matrix with dosing and citations above on this page.
Common side effects of Beta-carotene (≥ 1 in 100): Carotenodermia – yellow-orange discolouration of palms, soles and nasolabial folds (reversible, distinguishable from jaundice – sclerae stay white), Yellowish tint of colostrum and breast milk, Loose stools. See the Safety section for uncommon and serious reactions.
FDA category A. FDA Category A at physiological doses. Advantage over retinol: beta-carotene does not cause hypervitaminosis A and is not teratogenic, so it is the form used in pregnancy when needed. High doses (>30 mg/day) in pregnancy are not studied and not recommended.
Compatible (Hale L1). Beta-carotene enters milk and gives colostrum its yellowish tint – this is normal. Daily intake during lactation 1300 μg RAE (about 8 mg beta-carotene).
Beta-carotene is contraindicated in: Current smoking or smoking within the last 10 years (lung cancer risk); Occupational asbestos exposure; Hypersensitivity to beta-carotene. Full list in the Safety section.