Our bodies absorb Vitamin B12 through the digestive system, so individuals with gut issues, such as Crohns disease or celiac disease, may have trouble absorbing enough Vitamin B12 through their diet alone
doi:10.1038/s41391-022-00587-6
The Jains in India eat a vegan diet, but, he said, all the Jain doctors I know have B12 injections
Here are a couple of things to check
We did not receive public comments on this provision, and therefore, we are finalizing without modification our proposal to calculate the costs upon which the payment rates for blood and blood products are based using the actual blood-specific CCR for hospitals that reported costs and charges for a blood cost center and a hospital specific, simulated, blood-specific CCR for hospitals that did not report costs and charges for a blood cost center
For mild cases, high-dose oral supplements can work just as well