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α-Carotene is a form of carotene with a β-ionone ring at one end and an α-ionone ring at the opposite end. It is the second most common form of carotene.
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Human physiology
In United States adults and Chinese adults the mean concentration of serum α-carotene was 4.71 µg/dL, including 4.22 µg/dL among men and 5.31 µg/dL among women (to convert to micromoles per liter, multiply by 0.01863).
Health effects
Dietary intake affects blood levels of α-carotene, which in one study was associated with significantly lower risk of premature death.
References
Alpha-Carotene Wikipedia(Text) CC BY-SA