Boldine is an apomorphine isoquinoline alkaloid extracted from the root of the pheasant pepper (Litsea cubeba) . Boldine is an oral effective antioxidant, anti-inflammatory, antitumor agent, and can inhibit osteoclast formation. Boldine induces apoptosis of human bladder cancer cells by regulating ERK, AKT and GSK-3β. Boldine ameliorates bone destruction by down-regulating the OPG/RANKL/RANK signaling pathway. It can be used in rheumatoid arthritis research[1][2][3].