Most commonly reported Mild stimulant-like effects (warmth, slight resting heart-rate rise) in the first 1 to 2 weeks
Scientific References Cobalin-H 1000 microgram/ml Injection (SmPC)
Aging reduces NAD+ synthesis pathways while increasing consumption by enzymes like CD38 and PARPs, activated by inflammation and damage.[13][15] CD38, an immune-related enzyme, ramps up with age, breaking down NAD+ precursors
It ends up much cheaper, as you can spend as little as a few dollars per shot, compared to hundreds of dollars at private clinics
Vitamin B12 injections can treat a number of different health conditions, so how often you can take these injections will depend on the reasons why you need the B12 in the first place
doi:10.1016/j.amjoto.2021.103337