Similac Isomil is formulated specially for infant feeding needs from birth. Similac Isomil is a soy based, milk free, lactose free spray dried infant formula, to meet the special nutritional needs of infants suffering from lactose intolerance, milk allergy and diarrhoea. For over 85 years, Abbott Nutrition has set the standards for science-based infant nutrition and has been nourishing millions of babies worldwide.