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Mol Cell Endocrinol 2017;443:72-9

B12 in buttock or arm

"B-Vitamins and Bone HealthA Review of the Current Evidence"

But in practice, and especially with regard to synthetic and recombinant peptide forms, there are some considerable potential safety concerns: Immunogenicity Most notably, per a 2020 assessment on therapeutic peptide safety, synthetic and recombinant peptides pose the risk of immunogenicity the ability of a substance to provoke an immune response.15 An immunogenicity-inducing peptide, when introduced to the body, would cause the bodys immune system to perceive the peptide not as a medication but as a threat

Interactions with Medications and Substances Alcohol and Caffeine: Regular consumption of alcohol may interfere with the body's ability to absorb vitamin B12, potentially diminishing the efficacy of the injection and leading to suboptimal relief from deficiency symptoms