This week the journal “Allergy” printed a report of three cases where allergic sensitization in preterm infants is attributed to the human milk fortifier Similac.
The product contains: Nonfat milk, corn syrup solids, whey protein concentrate, and MCT oil (fractionated coconut or palm kernel oil) as sources of proteins, fat, and carbohydrate (Abbott Laboratories Pediatric Nutritional Products Guide, DIR/98A08, 2008, Mississauga, Canada).
Not listed above but in the Products Guide are 120 IU/100 ml D3 which may indeed function as a sensitizer.