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vitamin b12 injections cause black stool Why Is My Poop Black? What's Normal and When to Worry Can Vitamin B12 Cause Diarrhoea?
Description
Normal B12 levels by age in Konya, Turkey The next study from Turkey measures vitamin B12 levels by age (0 to 24 years)

Sterile technique: Use a fresh sterile U-100 insulin syringe each time and drop it straight into a sharps container afterward

PLOS Pathog

2018;360:k724
However, these differences did not reach statistical significance owing to the limited number of studies