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B12 injections are a reliable solution for vegans and vegetarians to ensure they meet their nutritional needs and avoid deficiency-related health problems

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Rapidly progressing maculopathy with severe photoreceptor and ganglion cell loss, renal thrombotic microangiopathy, hemolytic uremic syndrome, pulmonary hypertension, and pulmonary thrombotic events have also been described in adult-onset cobalamin C defect (42

Andersson & Arner, 2004)

I also know people that are taking oral versions of this and I think that science has shown that thats completely useless

Safety Takeaway: While the evidence from controlled human trials suggests a manageable adverse event profile, the products full extent of long-term safety, especially regarding chronic and rare side effects, remains undetermined until the completion of ongoing large-scale clinical programs and subsequent regulatory review and approval