Phycocyanobilin (PCB) is an open-chain tetrapyrrole chromophore covalently bonded to both polypeptide chains of C-Phycocyanin (C-PC), the most represented biliprotein of Spirulina platensis, the mechanisms by which it protected cells included the reduction of oxidative stress damage, which could contribute to its clinical efficacy for the treatment of neurodegenerative diseases.This product has poor solubility, animal experiments are available, cell experiments please choose carefully!