Vitamin B12 injections are subcutaneous injections administered in your thigh, abdomen, or upper arm
This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation
If you have elevated B12 and symptoms like fatigue, weight loss, or abdominal pain, the symptoms are likely from the underlying cause of the elevation , not from the B12 itself
The hype is driven by marketing, not medicine
Active injury recovery: 4.0 to 6.0mg total daily, or 20 to 30 units