How many herbs can you say have ties to the original alcoholic version of Coca-Cola and the original version of the margarita? The damiana herb certainly has a colorful history that can be dated back to the Mayan Indians, most notably with improving sexual function in both males and females. No wonder Coke called itself the "real thing" -- well, that and the coca leaves used in the original formula. The herb is actually a small shrub that can be found in hot and humid regions