Pure Encapsulations l-Tryptophan offers support for mood, emotions, sleep and relaxation. L-Tryptophan may play an essential part in the synthesis of melatonin as well as serotonin hormones. These hormones can inform our response to stress sleep waking cycles and our mood. L-Tryptophan 500 mg from Source Naturals when taken regularly may improve certain symptoms of low mood by increasing the production of serotonin in our brains.The essential amino acid L-Tryptophan is not produced in the body and must be sourced from a balanced diet. This amino acid is usually found in protein rich foods like red meat yogurt fish milk and more. However modern erratic lifestyles may wreak havoc on our diet which is more often than not incomplete and imbalanced. That's why this dietary supplement from Source Naturals may be so beneficial it may possibly go a long way in supporting your body's need for L-Tryptophan. Recommended use: 2 capsules, 1-3 times daily between meals, or as directed by a healthcare professional.