It must be determined by the healthcare professional according to the patient's needs. As a supplement: 1-3 vials/day. As a single food source: 1-3 years: 3-5 vials/day; 4-6 years: 5-6 vials/day; 7-10 years: 6-7 vials/day; 11-12 years: 7-8 vials/day.