why do i get b12 injections The Advantages of Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Best Vitamin B12 Injection Site:

However, some observational studies have linked very high supplemental intakes of B12 with potential health risks, including increased rates of certain cancers or fractures in specific populations

Benoist, Caroline C et al

How to Prepare

You should contact your GP or NHS 111 if you experience: Persistent diarrhoea lasting more than 7 days in otherwise healthy adults Blood or mucus in stools , which may indicate inflammatory bowel disease or infection Severe abdominal pain or cramping that is worsening or different from previous digestive symptoms Unexplained weight loss alongside bowel changes Signs of allergic reaction , including rash, itching, swelling, or difficulty breathing (call 999 or go to A&E for severe reactions) Neurological symptoms such as numbness, tingling, balance problems, or memory difficulties, which may indicate B12 deficiency is not being adequately treated Seek help sooner if you have red flag symptoms, are pregnant, immunosuppressed, elderly, or have significant underlying health conditions

J Clin Invest 1963;42:1816 1834

Vitamin B12 is usually found in animal products, including food like meat and fish