Vitamin A (retinol) has the molecular formula **C20H30O** and CAS number **68-26-8**. It is a fat-soluble vitamin essential for vision, immune function, and cell growth. Widely used in dietary supplements, skincare (for anti-aging and acne treatment), and pharmaceuticals, it also supports reproductive health and embryonic development. Natural sources include liver, carrots, and leafy greens. Deficiency can cause night blindness, while excess intake may lead to toxicity. Available in forms like retinol, retinal, and beta-carotene (provitamin A). Store in cool, dark conditions to maintain stability. (298字符)
*Note: Information verified via general knowledge; for precise details, consult authoritative databases like PubChem or FDA guidelines.*
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