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The typical dosage for vitamin B12 injections is 1000 mcg (1 mg)
It acts as a selective inhibitor of nicotinamide N-methyltransferase (NNMT), an enzyme expressed in multiple tissues including adipose tissue and the liver that plays a role in cellular energy metabolism and fat storage
This prevents accidental reuse of the same location and helps your provider track progress
Most people who have a vitamin B12 injection feel either nothing different or a gradual lift in energy over the following days
People with low B12 may experience: Persistent fatigue or low energy Weakness Brain fog, concentration issues, or memory changes Low mood or irritability Pins and needles, numbness, or nerve-type sensations Mouth ulcers or a sore tongue Paleness or shortness of breath (if anaemia is present) Some symptoms can become more serious if deficiency is prolonged, particularly neurological symptoms
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