Sappan has the functions of promoting blood circulation, dredging collaterals, removing blood stasis, relieving pain, expelling wind and promoting blood circulation. Panax notoginseng mainly plays the role of promoting blood circulation, while Lycium barbarum mainly plays the role of nourishing yin. Don't do this unless you have blood stasis and yin deficiency. It's better to use crocodile brother to tonify kidney and strengthen yang. Brother crocodile can tonify kidney and strengthen yang, delay time, improve sperm quality, resist fatigue, increase penis size and significantly enhance sexual excitement. Many netizens said yes.