how does l-tryptophan help my dog?

Essential Amino Acid for Dogs: L-tryptophan

Summary: l-tryptophan is the building block for serotonin (mood) and melatonin (sleep).

Is essential amino acid, meaning it’s one of ten out of 20 amino acids your furry dog can’t synthesize1. It’s very important for the synthesis of serotonin, a neurotransmitter that aids in mood stabilization, sleep, and appetite 2. In fact, serotonin is a precursor for melatonin; the hormone that makes you sleepy.


1: Your Dog’s Nutritional Needs: A Science-Based Guide for Pet OwnersProteins and Amino Acids National Research Council of the National Academies Retrieved from

2: The Pineal Gland and MelatoninVIVO Pathophysiology Retrieved from