First, rule out any underlying conditions such as kidney or liver disease, cancer, or other blood disorders, as these can raise B12 levels
The NHS schedule for treating B12 deficiency is a loading dose of 1mg hydroxocobalamin by intramuscular injection every two to three days for two weeks, then a maintenance dose every two to three months for life when the cause is non-dietary
Gastrointestinal side effects from B12 supplements are typically mild, transient, and often related to inactive ingredients rather than the vitamin itself
Drug Delivery And Translational Research
Nothing here constitutes medical advice, dosing guidance or a recommendation for human or veterinary use
Overdoing it, especially through improper supplementation or injections, can lead to unwanted risks