B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. VITAMIN B12 INJECTION Cyanocobalamin (B12) Products American Regent Types of injections explained Intramuscular (IM) Inserted at 90 to deliver medication deep into the muscle, allowing relatively fast absorption due to rich blood supply. Subcutaneous (SC) Inserted at about 45
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