1. Food and beverage industry: L-phenylalanine is a natural food additive that can be used to enhance the flavor of food. 2. Pharmaceutical industry: L-phenylalanine is an important raw material for the preparation of certain drugs, such as antidepressants, peptide drugs, etc. 3. Nutritional supplements: Since L-phenylalanine is an essential amino acid, it can be used as a dietary supplement to improve nutritional status.