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what is the usual injection dosage for b12 VITAMIN 3000 mcg B Vitamin IV Therapy —
Description
Their papers abstract could be interpreted to suggest that the B12 content in multivitamins was decreased by storage time, light exposure, temperature, and vitamin C

The difference between the two is that intramuscular injections are inserted into the muscle, and subcutaneous injections are inserted just below the skin

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References Food and Drug Administration

28 days is the FDA requirement for producers of multi-use vials to prove their bacteriostatic maintains efficacy
