Der Mensch benötigt Vitamin A1 (Retinol), kann aber auch Provitamin A (β-Carotin) nutzen. Da das Provitamin nicht gleichermaßen umwandelbar ist, ist sein Bedarf höher.
| Physiologie | |
| Funktion | Bestandteil des Sehpigments, Wachstumsfaktor, beteiligt bei Testosteronbildung |
| Täglicher Bedarf | 0,8–1,0 mg |
| Folgen bei Mangel | u. a. Haarausfall, Sehstörungen (z. B. Nachtblindheit), Atrophie (Gewebeschwund) von Schleimhäuten und Speicheldrüsen |
| Überdosis | 7,5 mg |
Nähere Infos unter:
http://www.gesundleben24.info/vitamin_a.html
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