This is an essential amino acid that must be obtained through your diet (4). It’s found in a wide variety of foods — both plant and animal sources
Phenylalanine has been studied as a treatment for several medical conditions, including skin disorders, depression and pain (3) and is crucial for the production of other molecules, including:
- Tyrosine: This amino acid is produced directly from phenylalanine. It can be used to make new proteins or converted into other molecules on this list
- Epinephrine and norepinephrine: When you encounter stress, these molecules are vital for your body’s “fight or flight” response.
- Dopamine: This molecule is involved in feelings of pleasure in your brain, as well as forming memories and learning skills.
Contraindications - can be dangerous for people with the genetic disorder phenylketonuria (PKU) (7).