By increasing serotonin levels, L-tryptophan not only helps us fall asleep and stay asleep, but it also promotes mental health in those with low serotonin levels and provides dietary support against nervousness and tension. TryptoPure® is the purest tryptophan available. SUPPLEMENT FACTS: Serving size = 1 capsule. Amount Per Serving: Ajinomoto TryptoPure® L-Tryptophan (100% pure pharmaceutical grade L-Tryptophan) = 500 mg. Other Ingredients: 100% pure vegetable source cellulose (vegetable capsule). SUGGESTED USE: As a dietary supplement, take one capsule with water 30-60 minutes before sleeping. For maximum benefit, take two capsules. WARNING: Do not take this product if you are taking a prescription antidepressant or if you are pregnant or nursing. Consult your healthcare provider before use if you have a medical condition or if you are taking any prescription medications.