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An essential amino acid, L-tryptophan must be obtained from your diet intake or from L-tryptophan supplements, as your body cannot naturally produce it on its own. Tryptophan is a great natural sleep supporter, as it helps maintain healthy levels of serotonin, the “feel-good hormone.” By managing serotonin levels, it also promotes positive mood, healthy emotional well-being and even weight management. Check out the product reviews on the L-tryptophan supplements below to see how it’s helping others.