scjp-Maca is a superfood supplement that's been used for thousands of years by the Peruvians. If you choose to purchase some make sure it says gelatinized, NOT RAW. You do not want to consume raw maca.
http://www.littlebitbetter.org/eating-well/maca-root-superfood-star/ Many people take capsules cuz they find it easier for dosage. The typical dosage is starting w/2 caps & working your way up to what feels right for you. I take 3 in the morn and 2 in the early afternoon. It can give you energy so taking it past 2 or 3 pm is not advisable since it could keep you from sleeping.