The NHS gives hydroxocobalamin as an intramuscular injection, but published evidence shows the subcutaneous route is a recognised and similarly effective alternative
Vitamin B12 shots may not be suitable for people with a history of: sensitivity to vitamin B12 Lebers disease, which affects the optic nerve kidney problems hypokalemia (low potassium levels) deficiencies in other nutrients, particularly folic acid and iron Vitamin B12 injections typically begin to work straight away
Clinical research suggested doses in the range of 1-10mcg per kilogram of body weight showed efficacy, though most protocols standardized around 4-6mcg/kg for practical application
Intramuscular B12 Injection Sites Intramuscular (IM) injections yield better results and ensure faster absorption because the substance spreads directly to the muscle tissue
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