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People over 60, vegans, and vegetarians often need B12 shots, and the amount needed is measured in micrograms (mcg) and will depend on your age and the conditions that necessitate it
That said, oral supplements can vary
The synthetic, stable form of B12 used in most injections
Because this is a small-molecule salt rather than a peptide, the usual peptide precautions about mechanical shear and methionine or tryptophan oxidation do not apply
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