Nestle Nan PRO 4 is a spray dried follow-up formula with DHA, ARA, Vitamins A, C, D, Calcium, Zinc, and Iron for infants after 18 months and up to 24 months when they are not breastfed. Nestle NAN PRO 4 contains DHA. DHA helps support normal brain development. Also contains Iron. Iron helps support normal cognitive development. Contains Vitamins A, C and Zinc. Vitamins A, C and Zinc contribute to normal immune system function. Contains Calcium and Vitamin D. Calcium and Vitamin D help support normal growth and development of bones.