vitamin b12 injection how long to work Does A Shot Last Best Vitamin B12 Injection Site:

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Patients report less burning with a subcutaneous administration, which gives it a slight advantage over an intramuscular injection, according to the CDC

Supply shortages have been a recurring issue since the compound gained popularity, though manufacturing has been scaling to meet demand

Drinking a lot of alcohol or taking certain medicines can also affect B12 absorption

SUMMARY Research shows that cyanocobalamin may be absorbed better in your body, while methylcobalamin likely has a higher retention rate