Which tryptophan supplement is best? Tryptophan is an essential amino acid that’s naturally found in foods such as eggs, tofu and poultry. It plays an important role in the production of serotonin and ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Yup, pretty much everyone has made the Thanksgiving joke about tryptophan leading to couch naps, but I’m ...

Add Yahoo as a preferred source to see more of our stories on Google. "What is that stuff in turkey that makes you sleepy?" she asked. "Tryptophan," Jerry and George responded in unison. By the way, ...

Yup, pretty much everyone has made the Thanksgiving joke about tryptophan leading to couch naps, but I’m here to stop the allegations. Tryptophan doesn’t make you sleepy on Thanksgiving, and it ...