L-theanine is an amino acid. While more research is necessary, possible benefits include managing anxiety, relieving stress, and reducing insomnia. L-theanine is primarily found in green and black tea ...

Adam Benjamin has helped people navigate complex problems for the past decade. The former digital services editor for Reviews.com, Adam now leads CNET's services and software team and contributes to ...

Dec. 15, 2025 Natural killer cells act as the immune system’s rapid-response team, but the stress of anxiety and insomnia may be quietly thinning their ranks. A study of young women in Saudi Arabia ...