how often should vitamin b12 injections be given Injection Dosage and Frequency: 7 Guidelines for Adults How Often Can I Take

Needle gauge matters

Other forms of vitamin B12 exist, however, cyanocobalamin is the most thoroughly researched, affordable, and highly effective for most people (14)

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Large-scale, well-designed trials with proper randomization and blinding are needed to determine whether high-dose oral supplementation is as effective as intramuscular injection for increasing vitamin B 12 status and alleviating clinical symptoms of vitamin B 12 deficiency

They are inexpensive, quick to administer, and widely marketed as fat-burning shots

(2 included in review discussed above)