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For a person who cannot absorb B12, the injection is a critical, life-sustaining treatment, not a voluntary supplement
Disagreements were resolved through discussion or by consultation with a fourth author (CS)
Theyre quick, safe, and deliver the vitamin directly into your bloodstream, skipping the digestive system entirely
Regarding the form of vitamin B12 used, cyanocobalamin was the most common (n = 14), followed by methylcobalamin (n = 6), hydroxocobalamin (n = 4), and combinations including adenosylcobalamin in isolated cases
Studies suggest 3065% of products may be contaminated or mislabeled, with risks including endotoxins, heavy metals, and incorrect sequences
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