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Head-to-head evidence comparison — which supplement is right for you?
Beta-Carotene vs Vitamin A: their evidence isn't directly comparable (one is unscored); take care combining them — there's a flagged interaction. Take the 60-second quiz for a pick tailored to your goals.
Vitamin A wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mixed evidence
7 of 16 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both Beta-Carotene and Vitamin A have evidence — compare verdict strength side-by-side.
No supplemental dose is recommended for skin colour. Beta-carotene from food carries none of the trial risk; the harm signal is specific to high-dose supplementation.
Food sources rather than a supplement
2500-5000 IU daily (retinol); up to 25000 IU (beta-carotene)
With fat-containing meal, Any time of day
Mixed carotenoids or low-dose retinyl palmitate
and 2 more not shown
CARET gave exactly this combination (30 mg beta-carotene plus 25,000 IU retinol) and found MORE lung cancer (RR 1.28) and more deaths from any cause (RR 1.17); the trial was stopped early.
Do not stack them. If vitamin A intake is the goal, dietary beta-carotene alone is the safer route because conversion is down-regulated once status is adequate.
Weeks
Years
Not applicable
2-4 weeks
2-4 weeks
4-8 weeks
With chronic excess
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) · Rct · n=29133
29,133 male smokers aged 50-69 randomised to alpha-tocopherol, beta-carotene, both, or placebo
Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease.
N Engl J Med (1996) · Rct · n=18314
18,314 smokers, former smokers and asbestos-exposed workers randomised to 30 mg beta-carotene plus 25,000 IU retinol or placebo
Antioxidant supplements for prevention of mortality in healthy participants and patients with various diseases.
Cochrane Database Syst Rev (2012) · Meta analysis
78 randomised trials with 296,707 participants; 56 trials at low risk of bias
Effects of primary or secondary prevention with vitamin A supplementation on clinically important outcomes: a systematic review of randomised clinical trials with meta-analysis and trial sequential analysis
BMJ open (2024) · Meta analysis · n=672
Vitamin A did not reduce mortality in individually randomised trials (RR 0.99, 95% CI 0.93 to 1.05; I²=32%; p=0.19; 105 trials; moderate certainty), and this effect was not affected by the risk of bias.
Vitamin and Mineral Supplementation During Pregnancy on Maternal, Birth, Child Health and Development Outcomes in Low- and Middle-Income Countries: A Systematic Review and Meta-Analysis
Nutrients (2020) · Meta analysis · n=451723
IFA supplementation showed notable improvement in maternal anemia and the reduction in low birthweight, whereas LNS supplementation had no apparent effect on outcomes; further research that compares LNS and MMN supplementation could help understand differences with these commodities.
Vitamin A supplements for reducing mother-to-child HIV transmission
The Cochrane database of systematic reviews (2017) · Meta analysis · n=6601
Antepartum or postpartum vitamin A supplementation, or both, probably has little or no effect on mother-to-child transmission of HIV in women living with HIV infection and not on antiretroviral drugs.
Vitamin A has gradable evidence while Beta-Carotene has insufficient evidence to score and wins in 2 of 3 categories.
Caution: CARET gave exactly this combination (30 mg beta-carotene plus 25,000 IU retinol) and found MORE lung cancer (RR 1.28) and more deaths from any cause (RR 1.17); the trial was stopped early. Do not stack them. If vitamin A intake is the goal, dietary beta-carotene alone is the safer route because conversion is down-regulated once status is adequate. Always consult a healthcare provider before combining these supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.