standard dose for vitamin b12 injection B.P 1mg/2ml A Guide to Vitamin B
Description
Anemia can also be caused by a restricted diet, poor iron absorption, repeated blood testing, or the hemodialysis removal of iron and vitamins

Thats why we test before symptoms

If you have a vitamin B12 deficiency, you might feel symptoms like fatigue, weakness, or tingling in your hands and feet

Yes, it can help

Antibody formation against semaglutide has been reported