These common skin molecules absorb light, from the ultraviolet to the infrared.
| Molecule | UVB | UVA | Visible | Infrared |
|---|---|---|---|---|
| Melanin | X | X | X | |
| NADH, NADPH | X | X | ||
| Nucleosides (2-thiouracil, 4-thiouridine) | X | X | ||
| Riboflavin | X | X | ||
| Porphyrins | X | X | X | |
| Tryptophan | X | X | ||
| Urocanic Acid | X | |||
| Collagen: Pentosidine in advanced glycation end-products | X | |||
| Collagen/Elastin | X | |||
| Bilrubin | X | X | ||
| Copper-Cytochrome C Complex IV | X | X | X | X |
