D-Phenylalanine increases the creation of endorphins that manage our awareness of pain. The concentrated form of D-Phenylalanine is available as pills, to relieve constant pain. It is used to increase the NSAID’s effects, so that even a low dose of other pain relievers would produce the desired effect. D-Phenylalanine converts to other amino acid (tyrosine). It obstructs the enzyme, enkephalinase, which enhances the pain in body. Supplements of D-Phenylalanine are taken by body builders to relieve them of the muscle pain they experience due to stressful routines. About 100mg to 200 mg of daily doses of D-Phenylalanine can be taken to treat depression.