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A 2016 review of 2 randomized clinical trials and 3 prospective studies concluded that oral B12 at 1,000 mcg a day was a safe and effective alternative to intramuscular injections

This is a commonly referenced study from 1963 claiming a half-life of 5-6 days: nature.com/articles/198200a0 Although I would not cite it as an authority, the six-day half-life has also made it onto the B12 page in Wikipedia, seemingly unchallenged

B12 shots, the key difference lies in the ingredients

Injection is given once a week if levels are low and once a month for maintenance

The B vitamins are used to create energy, theyre needed for the formulation of red blood cells, and to make neurotransmitters in the brain which affect mood and mental function, and theyre essential for detoxification of chemicals in the body