side effects of b12 deficiency injections What You Need to Know About Vitamin Doctor explains Vitamin B12 Deficiency

Documented side effects are usually mild to moderate: Injection-site pain, redness, or bruising Flushing Increased heart rate Nausea or gastrointestinal upset Headache Urinary changes or a fishy body odor at higher choline doses Because these are compounded products, sterile technique, pharmacy sourcing, and formulation verification matter

It is not intended as a substitute for professional advice from a qualified healthcare professional and should not be relied upon as personal health advice

Doses of folic acid greater than 0.1 mg per day may result in hematologic remission in patients with vitamin B 12 deficiency

It also makes sure you get the most benefit

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When B12 levels have been chronically low, your body adapts to functioning with deficiency