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Sleep SupportFrom TryptoPure®Dietary SupplementAjipure® Amino AcidVeganEncourages Healthy Sleep PatternsPromotes Normal Serotonin LevelsPromotes a Feeling of Calmness and RelaxationScience-Backed Quality Since 1969Looking for effective sleep support? Swanson L-Tryptophan offers 500 mg of L-tryptophan per capsule to help support healthy serotonin levels and provide restful sleep. L-tryptophan an essential amino acid has to be obtained in the diet or in supplement form. Extensive lot tests indicate no Peak-E in this product.