Serum peak is faster than IM, and B12 can be combined with hydration (saline), B-complex, vitamin C, magnesium, and other ingredients in the same bag
(1992) Effects of vitamin B12 on plasma melatonin rhythm in humans: increased light sensitivity phase-advances the circadian clock
Elevated blood glucose is a consideration for patients with prediabetes or insulin resistance, and we monitor for this during treatment
60 Dosages ranged from 2 g per day p.o
Any unused portion can be stored for later use for up to 60 days after initial opening instead of being discarded at the days end, as is the case with other injections
However, expectations should be calibrated to starting point