can you inject b12 into your stomach The Complete Guide to Shots Best Vitamin B12 Injection Sites:

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Earlier studies suggested that PA was restricted to Northern Europeans, but subsequent studies indicate that PA affects virtually all ethnic groups.37 Pernicious anaemia was considered a classical cause of vitamin B 12 deficiency before food-cobalamin malabsorption was described, and accounted for 15% to 25% of vitamin B 12 deficiency in the elderly in studies.9 In a local study on 296 Chinese patients, definite PA was diagnosed in 61% of patients having megaloblastic anaemia with vitamin B 12 or folate deficiency.38 Pernicious anaemia is characterised by destruction of gastric mucosa, especially fundal mucosa, primarily by a cell-mediated mechanism.39 There is progressive destruction and eventual loss of intrinsic factor producing gastric parietal cells

Therefore you should limit folic acid intake from foods and supplements to 1000 mcg per day

Vitamin B 12 fact sheet for health professionals

Estimated at 46 hours based on pharmacokinetic modeling

That said, patients with active diabetes or significant metabolic dysfunction should have any investigational peptide protocol reviewed by their endocrinologist or primary care physician alongside their supervising aesthetic medicine provider