Now Foods L-Tryptophan is a dietary supplement containing L- , an essential amino acid that cannot be synthesized by the body and must be obtained through diet. L-tryptophan is naturally found in protein foods such as dairy products, eggs, and legumes. Key Features of Now Foods L-Tryptophan 500 mg of pure L-tryptophan in one capsule. Exogenous amino acid – not produced by the body. Product suitable for vegans and vegetarians. GMO-free, gluten-free, kosher. 60 capsules – 2 months of supplementation. Each capsule provides 500 mg of pure L-tryptophan . This dietary supplement is suitable for adults who want to supplement their diet with this amino acid. L-tryptophan is known as a dietary component that occurs naturally in plant and animal products and is a building block of many organic compounds. This supplement comes in a convenient capsule form and is suitable for vegans and vegetarians.