nice guidelines b12 injections dose of Vitamin Injection Dosage for Adults: Cyanocobalamin Vitamin B12 Injection 1000 – b12 injection half life Dosage

Several factors can impair B12 absorption: Reduced stomach acid production (achlorhydria or hypochlorhydria), common in older adults and those taking proton pump inhibitors or H2-receptor antagonists long-term, impairs the release of B12 from food proteins Pernicious anaemia , an autoimmune condition destroying parietal cells and reducing intrinsic factor production, completely blocks the primary absorption pathway Gastrointestinal disorders including Crohn's disease, coeliac disease, or surgical removal of stomach or ileum sections directly damage absorption sites Metformin , commonly prescribed for type 2 diabetes, may reduce B12 absorption through unclear mechanisms

They are a great option for those who suffer from a vitamin B12 deficiency or just want to improve their overall health, especially in those who are unable to consume enough vitamin B12 through diet alone or who wish to experience the benefits much more efficiently as intravenous vitamins ensure that the entirety of what is injected into the body is able to be used, unlike consuming vitamins which are not 100% absorbed into the body

Heres what the science says

You're pregnant or plan on becoming pregnant while using B12 injections