L-Phenylalanine is an essential amino acid that supports the synthesis of proteins and the maintenance of a healthy nervous system. It can be converted into the neurotransmitters dopamine and norepinephrine, which are important for proper brain function. This product is free-form and vegan, and is certified soy-free, nut-free, vegan/vegetarian, non-GMO, egg-free, dairy-free, and made without gluten. It is manufactured in the USA by a family-owned and operated company with a long history of quality. Please note that natural color variation may occur and settling of powder may occur in the capsule.