 So, you know, first pass is get a B12 test. If your B12 is exceedingly low, we have to ask, what's the reason? Are you a vegan? Are you consuming no B12? Well, if you're eating adequate amount of B12, then we have to think, like, what is blocking your absorption? So you could be eating, you know, steak, and you could be taking B12 supplements, but if you lack parietal cell activity...