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Commonly reported minor adverse effects include nausea, headache, somnolence (drowsiness), and mild paresthesia (tingling or numbness) in the extremities

That is why it is also known as B12 shots

There are over 70 markers on the organic acids test including vitamins and antioxidants, oxidative stress, energy production, detoxification, neurotransmitter levels, oxalates, and intestinal yeast and bacteria

For those without an absorption problem, research suggests that high-dose oral B12 supplements can be as effective as injections in raising and maintaining B12 levels

A clinical study estimated that 85% of patients come up short of the necessary vitamin B12 from their meals