The primary active ingredient of Andro400 is Eurycma longifolia extract, according to Consumer Health Digest. Ando400 also contains amino acids that increase blood flow and circulation in the body. Andro400 Max contains the amino acids l-arginine and l-citrulline, according to Andro400.
The Eurycoma longifolia plant grows in Indonesia and Malaysia, where it was previously used as a traditional medicine for a variety of conditions, including pain relief, increased healing, energy and testosterone, and improved libido and sexual function, states Andro400. The amino acids, l-arginine and l-citrulline, widen the blood vessels in the body, which leads to better absorption of nutrients.
Independent studies confirmed that Eurycoma longifolia raises testosterone levels in men, states Consumer Health Digest. One Andro400 capsule contains 150 milligrams of Eurycoma longifolia extract.