[3, 5, 7] Taking vitamin B12 while pregnant is often deemed a good idea, as it may lower the risk of acute lymphoblastic leukaemia in children, which is why vitamin B12 is usually found in supplements for pregnant women alongside folate (vitamin B9)
It's not an approved drug, supplement, or food additive
methylmalonic acid, MM-CoA
They may be able to point you to info about after effects of B12 jabs
Those questions require a different level of scientific evidence. Ultimately, Khaldi says that good science is about asking questions and following the evidence: Patients deserve treatments supported by robust human clinical research, transparent data, and high-quality manufacturing
Clinical Trial Activity References et al