This is from Cathy Genna, who is having technical problems.: The reason there is soybean oil in abm is that it is a source of linolenic acid, which is converted into some of those long chain fatty acids baby needs so much. Linoleic acid, common in corn oil, actually inhibits this conversion. There was a big to-do a few years ago about powdered abm being deficient in linolenic acid, because there hadn't been a way to preserve dried soybean oil. Soybean oil immediately appeared in powdered abm's. I don't know about the composition of other oils. Any biochemists or nutritionists care to take a stab at this? Catherine Watson Genna, IBCLC NYC [log in to unmask] Kathleen B. Bruce, BSN, IBCLC co-owner Lactnet, LLLOL, Corgi-L Independent Consultant with Excellent Sense of Humor : D LACTNET WWW site: http://www.mcs.com/~auerbach/lactation.html LACTNET archives http://library.ummed.edu/lsv/archives/lactnet.html