Also known as: Provitamin A, E160a
Beta-carotene is the most abundant provitamin A carotenoid in the diet, converted to retinol in the body as needed. It also functions as an antioxidant and plays a role in immune regulation and skin protection against UV damage.
Beta-carotene is a fat-soluble carotenoid pigment found abundantly in orange and yellow fruits and vegetables, as well as dark leafy greens. The body converts beta-carotene into vitamin A (retinol) through enzymatic cleavage in the intestinal mucosa, with the conversion rate regulated by existing vitamin A status, preventing toxicity. As an antioxidant, beta-carotene quenches singlet oxygen and scavenges free radicals, protecting cell membranes from oxidative damage. It supports immune function by enhancing the activity of natural killer cells and T-lymphocytes. Dietary beta-carotene intake from fruits and vegetables is consistently associated with reduced risk of chronic diseases. However, high-dose supplementation (20–30 mg/day) in smokers has been linked to increased lung cancer risk in the ATBC and CARET trials, making supplementation contraindicated for current smokers and those exposed to asbestos.
Beta-carotene supplementation at moderate doses (6–15 mg/day) has been shown to enhance natural killer cell activity and increase circulating T-lymphocyte counts, particularly in elderly populations.
A meta-analysis found that beta-carotene supplementation for at least 10 weeks provides modest protection against sunburn by increasing the minimal erythemal dose (MED), functioning as an internal sunscreen.
With a fat-containing meal
Contraindicated at high doses (>20 mg/day) in smokers and former smokers. Food-based intake is preferred.
With a fat-containing meal
Not a substitute for sunscreen. Only for non-smokers.
Standardized dosing with enhanced absorption
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