Detailed Product Description: Phenylalanine is an essential amino acid, which plays a role in brain activity, mood and alertness. People with repetitive injuries, osteo-arthritis, rheumatoid arthritis, back pain, migraines, leg and muscle cramps would be well advised to include DLPA as part of their diet. DLPA enhances production of a compound cholecystokinin (CKK), which may reduce appetite.