Merve Ceylan is a dietitian and health writer with four years of experience writing for companies in the nutrition and health industry. Nick Blackmer is a librarian, fact-checker, and researcher with ...

Hint: It's probably more than the bird making you sleepy. Tryptophan is an essential amino acid that’s a vital building block for protein in the body. There are 20 known amino acids, nine of which ...

If you’re feeling tired, irritable, have brain fog or trouble sleeping make sure you’re paying attention to tryptophan. This time of year, we usually associate tryptophan with napping after ...