is b12 an intramuscular injection Amazing Benefits Of B12 Injections Cyanocobalamin (b12) Injection 2,000 mcg/mL
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They are compounded by licensed pharmacies under provider supervision

Conclusions Over 5 years, there are savings of $14.2 million to the health care system from switching to vitamin B12 oral supplements

Itching or mild rash

The 3.0 mL fill gives ~3.33 mg/mL, so 1 unit 33.3 mcg on a U-100 syringe (150 mcg = 4.5 units, 600 mcg = 18 units)
