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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

Because B12 is vital a deficit in B12 can affect our energy levels, cause stress, fatigue and brain fog

Our vegetarian or vegan clients, pregnant or breastfeeding individuals, older adults, and those with chronic liver disease or neurological conditions like multiple sclerosis may also qualify for injections if they are not taking a B12 supplement

Common combinations include semaglutide with B12 , which some compounding pharmacies offer as a pre-mixed formulation