Isomil Stage 1 Soy Protein Infant Formula 850g is milk- and lactose free. Its a soy protein formula with DHA and AA is perfect for babies 0 to 6 months who have lactose or other dairy allergies. Simply add the powder to cooled, boiled water. See packaging for measurements.- and lactose free. Its a soy protein formula with DHA and AA is perfect for babies 0 to 6 months who have lactose or other dairy allergies. Simply add the powder to cooled, boiled water. See packaging for measurements.