The stereoisomer D-phenylalanine (DPA) is usually made by traditional natural synthesis, both as an individual enantiomer or being a component from the racemic mixture. It doesn't get involved in protein biosynthesis although it is present in proteins in little quantities - specially aged proteins and food proteins that were processed. https://troyawqja.wikiap.com/995239/top_guidelines_of_phenibut_supplement_online