what's b12 injection for Compounded Cyanocobalamin (Vitamin B12) Vitamin B12 Injections: Benefits and
Description
2009 Oct;10(10):1105-16

It is a form of the vitamin

Intestinal absorption of vitamin B 12 requires successively three different protein molecules: haptocorrin, intrinsic factor and transcobalamin II

It fixes both deficiencies at once
