D aspartic acid is 100 pure and made from only the finest grade d aspartic acid it is an amino acid that plays a key role in producing compounds linked to muscle tissue growth and libido enhancement d aspartic acid is sourced from a tpwtm accredited supplier for the ultimate quality assurancer supplementing with tpwtm d aspartic acid can help stimulate signal molecules which in turn enhance activity within the testes and pituitary gland to help enhance lean growth strength and energy