If supplementation is responsible, your doctor may recommend reducing or stopping non-essential B12 intake, with repeat testing after an appropriate interval (typically 2-3 months, or longer if you've had recent injections or have kidney disease)
For adults running a standard protocol, it's fine, and it's the standard choice
Because the nutrients dont have to pass through your digestive system, the results are often faster and more noticeable
Scenario Weekly Units Vial Duration Loading (10 units 5/wk) 50 units ~4 weeks per vial Full 12-week cycle Variable ~23 vials Storage and Stability Store the reconstituted KLOW vial refrigerated at 28C and use it within approximately 28 days of reconstitution, consistent with the bacteriostatic preservation window
(PubMed) Houghton SC, Eliassen AH, Zhang SM, et al