: Because I think the insulin/diabetics issue is a salient one, I want to state something just in case someone raises this while I'm not around: today, a fairly high proportion of exogenous insulin comes from genetically modified E. Coli bacteria, and thus is not derived from animal byproducts. But this is a very recent development. Until just a few years ago, the vast majority of insulin received by diabetics was harvested from hogs. So if we adopt the Hitler standard of vegetarianism, then until the end of the 1990s no insulin-dependent diabetics were ever vegetarian. There are loads of other medications also derived from horses' blood, cattle spleen, and on and on and on.