Zinc Vit AD VIALS Dosage and Directions for Use It is recommended to take one vial for children, and half a vial for infants, preferably on an empty stomach. The dose can be doubled as needed. A 40-day cycle is recommended. Components - Freeze-dried vial: chelated zinc; royal jelly; vitamin A; vitamin D; vitamin C. - solvent vial: water; sucrose; orange; potassium sorbate (preservative). Format 20 vials of 10 ml