b12 supplement injection Methylcobalamin (Vitamin B12) Avoid exposure to light. Vitamin B12 Injection - 10mL

Overgrowth of bacteria: Some people develop vitamin B 12 deficiency as a result of conditions that slow the movement of food through the intestines (diabetes, scleroderma, strictures, diverticula), allowing intestinal bacteria to multiply and overgrow in the upper part of the small intestine

If you suspect you have experienced a side effect from any medicine or research chemical, you can report it to the MHRA via the Yellow Card Scheme (yellowcard.mhra.gov.uk)

Symptomatic improvement often precedes laboratory normalisation

This resulted in an increase in annual B 12 testing expenditure from $3.0 million to $5.6 million during the same time period

How to inject Vitamin B12