A new study shows that 1 in 5 packaged foods and drinks in the U.S. contain synthetic dyes, with Red 40 being the most common. These dyes are especially present in child-targeted products like candies ...

L-theanine is an amino acid, a.k.a. a molecule that helps build protein in the body. It’s known for being found in green tea, but it's also in other herbal brews such as white, black and oolong teas.