side effects of b12 injections in humans Vitamin Effects: Risks Excess Intake Vitamin B12 Benefits and Best

People Taking Certain Medications Long-term use of metformin (a common diabetes medication) and proton pump inhibitors (PPIs) like omeprazole can reduce B12 absorption over time

Closely connected to this work is the study of cellular energy regulation

A lack of vitamin B12 can lead to vitamin B12 deficiency anaemia which causes the body to produce abnormally large red blood cells that cannot function properly to carry oxygen around the body, leading to nerve damage or neuropathy

Because safety data remains limited, patients should avoid extended cycles unless a qualified provider determines that continued use is appropriate.