do b12 injections affect b12 levels Vitamin B12: Overdose and Side Effects Best Vitamin B12 Injection Site:
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Egger NG, Anderson KE, Lindenbaum J, et al

Methylmalonic Acid Levels among Older Adults Older adults appear to have higher average MMA levels without apparent consequence

The drug causes a reddish discoloration of the urine (chromaturia, which can look like blood in the urine), and of the skin

When this process is not carried out properly, usually due to a lack of intrinsic factor that helps with absorption, it leads to a B12 deficiency
