vitamin b12 injection training london Injections in Private Vitamin B12 injection service
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Or does the immune system react less and less each time the vaccine is given

PMID 19832808

Bowers, M
That makes injections your best bet if youre dealing with 1

When given by intramuscular injection, the dose bypasses the digestive tract and is absorbed reliably, which matters because dietary B12 absorption depends on stomach acid and a protein called intrinsic factor, both of which decline with age, medication and certain gut conditions
