My doctor recently said that we could switch to a store brand formula if LO took it well and we had no problems previously. We had not so I switched from Similac Advance to the Target Up&Up comparable. Everything I read said no one had troubles and first glance at the ingredients looked all the same except the Palm Olein which is in the Target brand, NOT similac. But it is in Enfamil. I got curious and started reading and have now read that palm olein might cause the calcium to be absorbed properly by the baby. Anyone else done research on this or asked their doctor?