Checking kidney and liver function, both of which can raise circulating B12 when impaired

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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
ADVERSE REACTIONS: Intramuscular injection can cause skin rashes, itching, diarrhea, and allergic asthma
Regular Monitoring: We track your progress and adjust the treatment as necessary