What is d aspartic acid d aspartic acid is an amino acid that is formed principally in the pituitary gland hypothalamus and testes d aspartic acid benefits this product is 100 d aspartic acid with nothing added or taken away who is d aspartic acid suitable for d aspartic acid would be ideal for anyone partaking in heavy resistance based training the dietary choices of all our customers are extremely important to us whilst this product is manufactured using ingredients and processi