can b12 injections cause bleeding Vitamin Deficiency in Pernicious Anemia: A Hemolytic Anemia Mimic Vitamin B12: Symptoms, Dosage &
Description
It is also available through an injection but is more commonly found in supplements

If you have been diagnosed with a deficiency it would be advised to have a course to replenish your levels then follow up with a monthly injection to maintain levels
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For research purposes, safety data are mainly relevant to dose-finding and study design in experimental models , not as endorsement of any clinical or self-administration use

You might see it more clearly if you hold the vial against a white background
