About 55,000 L.A. County workers walked off their jobs Monday night, disrupting public services from healthcare and social work to libraries and parks. Leaders of SEIU Local 721 said the two-day ...

L-tryptophan is an essential amino acid that helps the body make proteins and certain brain-signaling chemicals. Your body changes L-tryptophan into a brain chemical called serotonin. Serotonin ...