Maca is not a drug. It's a Peruvian root rich in minerals and aminoacids that has been taken for ages by Peruvian Indians, back to the Incas. It has many properties. They originally took it as a stimulant for endurance in high altitute and extreme cold-hot temperatures. It's been said to improve immunity and to aid in the reproductive system. In lab tests mice have shown increased testicle size and sperm production, and increased longevity. I've taken it intermitently (e.g. two 500mg a day for 3 months, then rest 1 month) and I do experience general wellbeing when I'm on it. Yes, my libido also increases and I tend to have more powerful erections and more copious ejaculations. But this is only to a certain extent and after an initial phase the effect wears off a bit. This is not a magical elixir; it's just a good supplement.