Maca is an adaptogen that is becoming increasingly popular. People mostly use it for "those things" and as a natural aphrodisiac, but it also has potential for endurance athletes. Unfortunately, all serious studies in that regard have so far been performed on animals.
Take two capsules daily with a meal.
Dietary supplement. Ingredients: maca 4:1 (Lepidium meyenii) (rizoma) 500 mg (equivalent of 2000 mg of fresh maca)*. Other ingredients: gelatin, may contain one or more of the following: microcrystalline cellulose (plant fiber), magnesium stearate, silicon dioxide. Net quantity: 60 capsules. *Daily value not established. Amount in one capsule.