Applied Nutrition PhenylAde Essential Drink Mix – Vanilla – 40gm Packet from FirstOptionMedical.com is the foundation for building a healthy PKU diet. Children and adults can use it as part of a balanced PKU diet that limits phenylalanine. PhenylAde Essential provides an ideal blend of vitamins and minerals with a superior amino acid profile. Enhanced with both Omega-3 and Omega-6 fatty acids and soluble fiber. Each serving (40g) provides 10 grams of phenylalanine-free protein.