Tretinoin is the acid form of vitamin A. It is also known as all trans retinoic acid, or ATRA. As a drug, it can be used used for the treatment of acne vulgaris and keratosis pilaris. The medicine goes under several brand names.
| Fat soluble |
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| Water soluble |
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| Combinations | |||||||||
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| Carotenes (C40) | |
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| Xanthophylls (C40) | |
| Apocarotenoids (C<40) | |
| Vitamin A retinoids (C20) | |
| Retinoid drugs | |
