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According to the Office of Dietary Supplements at the National Institutes of Health, the average adult age 19 or older needs 2.4 mcg of B12 daily (or 2.6 mcg for pregnant women and 2.8 mcg for women who are breastfeeding)

Further analysis suggested that the peptide may have increased the ratio of Bcl-2/Bax, and potentially decreased cleaved caspase-3 and PARP levels, two markers of cell death

And besides, what happens if you inject B12 wrong

Research examining NNMT activity studies its role in nicotinamide metabolism, SAM availability for cellular methylation reactions, and NAD salvage pathway interactions in controlled laboratory systems

2 B12 deficiency can be due to inadequate dietary intake, in particular in people following a strict vegan diet (B12 is only found in animal foods)