The amino acid known as L-citrulline is made naturally in your body. Research isn’t clear whether these supplements will help boost exercise performance, lower blood pressure, or help with erectile ...

L-theanine is an amino acid found primarily in green and black tea and some mushrooms. It’s also available in pill or tablet form. It’s said to help ease anxiety, stress, and reduce insomnia. Before ...

L-carnitine, also known as levocarnitine, is a naturally occurring amino acid structure that the body produces. It plays a critical role in energy production, converting fat into energy. Most people ...