| Active principles | Rating | Bibliogr. | Expand | |
|---|---|---|---|---|
| 1 | Ferrochelatase | 100 | + | |
| 2 | Protoporphyrins | 66 | + | |
| 3 | Iron Carbonyl Compounds | 32 | + | |
| 4 | Carotenoids | 25 | + | |
| 5 | Receptor, Melanocortin, Type 1 | 21 | + | |
| 6 | Porphyrins | 20 | + | |
| 7 | beta Carotene | 13 | + | |
| 8 | Hemin | 10 | + | |
| 9 | Heme | 9 | + | |
| 10 | 5-Aminolevulinate Synthetase | 9 | + | |
| 11 | Griseofulvin | 7 | + | |
| 12 | alpha-MSH | 6 | + |