There are plenty of sources of calcium in vegetables, it’s not comparable to B12 (which has been found to be produced in the human upper intestinal tract as evi

There are plenty of sources of calcium in vegetables, it’s not comparable to B12 (which has been found to be produced in the human upper intestinal tract as evidenced by multiple studies going as far back as 1980 https://www.ncbi.nlm.nih.gov/m/pubmed/7354869/ https://www.ncbi.nlm.nih.gov/m/pubmed/7354869/, despite the claims all over the Internet otherwise. It’s just poorly understood why some guts lack it). The only thing a vegan has to supplement with a proper diet is B12. Eating tofu and fortified soy milk every day gets you most of the way there for calcium (it’s set using calcium sulfate as coagulant). I’ve already had 300mg in my breakfast today by eating oats with fortified soy milk.