Evidence supporting the use of: Alpha-carotene
For the health condition: Eyesight (poor)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Alpha-carotene, like its more well-known counterpart beta-carotene, is a provitamin A carotenoid found in various fruits and vegetables, such as carrots and pumpkins. The connection between carotenoids and eye health stems from their role as precursors to vitamin A, which is essential for normal vision. Vitamin A is critical for the formation of rhodopsin, a pigment in the retina that is necessary for low-light (scotopic) vision. Deficiency in vitamin A can lead to night blindness and, in severe cases, complete blindness.

While most research and clinical recommendations focus on beta-carotene and other carotenoids like lutein and zeaxanthin for eye health, alpha-carotene also contributes to vitamin A levels in the body, albeit less efficiently. There is some evidence that increased dietary intake of carotenoid-rich foods is associated with a reduced risk of age-related macular degeneration and other eye disorders, but the specific role of alpha-carotene is less well defined.

The evidence for alpha-carotene's direct benefit in treating or preventing poor eyesight is limited and largely extrapolated from broader studies on carotenoids and vitamin A. Therefore, the scientific support for using alpha-carotene specifically for poor eyesight is modest (rated 2/5), with most benefits attributed to its provitamin A activity rather than unique properties. Supplementation with alpha-carotene alone is not typically recommended for this condition; a balanced intake of various carotenoids through diet is generally advised.

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