I found this to be true according to the confessions of people who eat meat. Why are so many meat eaters deficient as well? This is not from a study this is actual people who confess to having B12 issues that eat animal products.
Printed copy · Anthology Volume 1, page 410Printed copy from The Tender For Law Anthology, Volume 1, page 410 (printed 14 June 2014). Added by this site; not part of the Facebook export.