Buy Isotonix® L-TryptophanIsotonix® L-Tryptophan is an isotonic version of the essential amino acid, l-tryptophan.  L-Tryptophan is an essential amino acid that helps maintain healthy levels of serotonin in the brain.  Serotonin helps regulate mood.  Isotonix® L-Tryptophan provides maximum results by combining itself with niacin and Vitamin B6, members of the B vitamin family, which promote normal absorption of L-tryptophan.  By supplementing with Isotonix® L-Tryptophan, healthy levels of serotonin in the brain will help enhance mood and support sleep.*

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*These statements have not been evaluated by the Food and Drug Administration as all supplements are not required to be monitored by the FDA. The featured products on this site are not intended to diagnose, treat, cure or prevent any disease. is owned by a Market America Independent Distributor (read About section) who earns from the sales of products showcased on this site and on