PVL DAA+ Natural Testosterone Support works as a specialized neurotransmitter in parts of the nervous system involved in hormone production. It has been shown to stimulate the release of (LH) Luteinizing Hormones and (GH) Growth Hormones from the pituitary gland. It also stimulates testosterone production. Fast becoming one of the most reliable new products to come out in years. Can be taken alone, or stacked with other supplements including pre-workout powders, creatine, glutamine or BCAAs. Do not take with whey protein in the same shake (complex proteins like whey may interfere with d-aspartic acid's uptake).