Vitamin A
Fat-soluble vitamin essential for vision, immune system, and skin health. Available as retinol (preformed) or beta-carotene (provitamin).
💡 Absorption: Retinol is more potent than beta-carotene. Beta-carotene is safer as the body regulates its conversion. Take with fat.
⚠️ Caution: Retinol is teratogenic: CONTRAINDICATED in pregnancy at doses >3000mcg. Excess causes hepatic toxicity. Beta-carotene is safer.
Recommended doses
Range: 700 – 3000 mcg RAE
RDA: 900mcg men, 700mcg women. Beta-carotene is safer
Range: 700 – 1500 mcg RAE
Essential for night vision
🏥 Contraindications
Dosis altas de vitamina A (>10.000 UI/día) son teratogénicas y pueden causar malformaciones fetales.
→ No superar 3.000 UI/día. Preferir betacaroteno como fuente segura.
La vitamina A es hepatotóxica en exceso y se acumula en el hígado. En pacientes con enfermedad hepática puede agravar el daño.
→ No suplementar vitamina A sin supervisión médica. Preferir betacaroteno en caso necesario. Controlar función hepática.
📚 Scientific references (3)▼
High-dose beta-carotene increases lung cancer risk in smokers; low doses may be protective.
Vitamin A derivatives improve skin appearance and reduce photoaging signs.
Vitamin A is essential for maintaining epithelial integrity and immune cell function.
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