(+)-Pinanediol is a chiral terpene diol identified as (1S,2S,3R,5S)-(+)-Pinanediol, and it acts as a potent inducer of melanin biosynthesis. (+)-Pinanediol promotes pigmentation and nitric oxide (NO) production in S91 melanoma cells, suggesting its involvement in melanogenic signaling pathways and its utility as a bioactive compound in pigment cell biology research.