. . "I do not have any links (yet) that proves that B12 intake is reduced due to an 'unclean' digestive system (maybe you do?), but if you look at the pictures in this thread, you might agree that it is very likely that intestines that have been exposed to toxics, unhealthy foods, pesticides etc. for years is not really capable of absorbing all the B12 and other nutrients we consume." . .