Everyone in the drugstore has some, but I haven't learned about it in detail. You don't need to take medicine to tonify kidney and strengthen yang. You can also eat venison, shrimp, oxtail, leek, black-bone chicken, loach, donkey meat, sea cucumber, hippocampus, mutton and so on. Men who tonify the kidney and strengthen Yang Can buy the kind of Changhong East Brother Ali soaked in water, which is called a national treasure in Malaysia, and I often buy soaked water myself.