air bubble in b12 injection SI I forgot to clear the befor Doctors flick the syringe to

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These may be due to defective DNA synthesis inhibiting replication in a site with a high turnover of cells

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Clinical indications include deficiency due to inadequate diet or malabsorption, drug-induced deficiency (for example, from long-term isoniazid or oral contraceptives), and certain inborn errors of metabolism (such as pyridoxine-dependent seizures or sideroblastic anemia)

In people over 60, the prevalence is around 2%.[ref] The lack of vitamin B12, though, can cause symptoms long before developing pernicious anemia