Gretchen, I've heard that the gut is permeable to those large molecules for about 3 months, but I have nothing whatsoever to back it up. I've even inquired of the source of this anecdotal info, but failed to come up with a reference. If someone else does, please include me! -Lisa ************************************************* Lisa Marasco, BA, LLLL, IBCLC [log in to unmask] / [log in to unmask] *************************************************