(+)-Pinanediol is an effective inducer of melanogenesis. In S91 cells, it acts by inducing higher levels of pigmentation and synthesis of nitric oxide (NO).
Noroxyhydrastinine exhibits potent melanogenesis-inhibitory activities, it inhibits melanogenesis, at least in part, by inhibiting the expression of protein levels of tyrosinase, TRP-1, and TRP-2 in α-MSH-stimulated B16 melanoma cells.
Tyrosinase-IN-5 (compound 16c) is a highly effective inhibitor of tyrosinase, exhibiting an IC50 value of 0.02 μM. This compound efficiently suppresses melanogenesis while posing minimal toxicity to cells [1].