Maca (Lepidium meyenii, also known as Lepidium peruvianum) is a cruciferous root vegetable native to the high Andes of Peru, where it has been cultivated for over 2,000 years at altitudes between 3,800 and 4,500 meters — one of the harshest agricultural environments on the planet. Traditionally consumed as a food staple and medicine by Andean communities, maca has become one of the most popular adaptogenic supplements worldwide, marketed primarily for its effects on energy, libido, hormonal balance, and fertility. The root is harvested as a turnip-like hypocotyl, dried, and traditionally consumed as a powder mixed into foods, beverages, or porridge. In the supplement industry it is available as raw powder, gelatinized powder (pre-cooked to improve digestibility), and concentrated extracts standardized to macamide content. Maca is not psychoactive in the conventional sense — it does not produce an altered state of consciousness or acute intoxication. Instead, its effects build gradually over days to weeks of consistent use, functioning as what traditional and integrative medicine practitioners call an adaptogen: a substance that helps the body resist physical, chemical, and biological stressors while normalizing physiological function. The bioactive compounds responsible for maca's effects include macamides (unique fatty acid amides found nowhere else in nature), macaenes (unsaturated fatty acids), glucosinolates (sulfur-containing compounds shared with other crucifers like broccoli and cauliflower), alkaloids, sterols, and a range of minerals including iron, iodine, potassium, and zinc. Maca comes in 13 recognized color varieties based on the outer skin of the hypocotyl, with yellow, red, and black being the three most studied and commercially significant. Each color appears to have a somewhat different phytochemical profile and, according to both traditional use and emerging research, different therapeutic strengths — though rigorous human clinical trials comparing color-specific effects remain limited. Clinical evidence supports maca's effects on sexual desire, with multiple randomized controlled trials showing significant improvements in self-reported libido independent of changes in sex hormone levels. Evidence for effects on energy, mood, menopausal symptoms, and male fertility ranges from promising to preliminary. Maca is considered safe for most people at typical supplemental doses of 1.5 to 3 grams per day, with no serious adverse effects reported in clinical trials lasting up to 16 weeks.