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J Clin Pharmacol

Vitamin B12 also helps to break down carbohydrates and turn fats and proteins into energy, so if you're not getting enough B12, your body might not be doing these things well, resulting in some unwanted weight loss

Clin Sci (Lond)

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Unless the body is deficient, B12 injections are unlikely to increase energy levels or improve performance

Summary: Vitamin B12 supplements can occasionally cause mild stomach side effects including nausea, diarrhoea, abdominal cramping, and indigestion, though these are generally uncommon and temporary