Pharmaceutical grade represents 43.3% within the grade segment and d-phenylalanine accounts for 41.3% of the form category in 2025. The phenylalanine market was valued at USD 811.1 million in 2025, is projected to reach USD 1296.2 million by 2035 and is forecast to post a 4.8% CAGR between 2025 and 2035.