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how often to inject vitamin b12 Shots Dosage for Adults: Much and How B12 Shots at Home: How,
Description
Patients should be offered this alternative after an informed discussion on the advantages and disadvantages of both treatment options. oral vitamin B12 is an effective alternative to vitamin B12 IM injections Cochrane Review

Some research suggests low vitamin B12 levels are associated with higher body weight, but more research is needed in this area

Very easy process

Polycythemia vera has also been reported with parenteral methylcobalamin

I would recommend this for anyone trying to improve performance
