Men Active from Doppelherz® acts at two levels: on the short term, Caffeine and Ginseng have a stimulating and energizing effect, Gotu cola increases peripheral circulation that supplies blood to the genitals, and Maca acts on the metabolism of nitric oxide, which is released after sexual stimulation to initiate penis erection. On the long term Maca has a positive influence on the mood and the mind by moderating stress perception and therefore helps to regain self- confidence. Moreover Maca contains high amounts of arginine, phytosterols, flavonoids and tannins that have a positive effect on the circulatory system, nerve impulses conduction and sperm quality. Zinc helps maintain elevated levels of testosterone and Selenium and Vitamin E are important for sperm formation.