D-Aspartic Acid is an Amino Acid that is created in the testes, Pituitary gland & the Hypothalamus. D aspartic acid has been shown to increase libido, luteinising hormone production, testosterone production & muscle growth. During a trial in Italy D aspartic acid (DAA) participants who used D aspartic acid saw a 42% increase in testosterone levels in 12 days* D aspartic acid also plays a role in brain function as it stimulates NMDA receptors in the brain. Our D aspartic acid comes in a huge 500g bag for great value for your money. * The role & molecular mechanism of D-aspartic acid in the release & synthesis of LH & testosterone in humans & rats Enza Topo 1, Andrea Soricelli 2, Antimo D' Aniello 1, Salvatore Ronsini 3 & Gemma D' Aniello 3*