Improper administration or contaminated products can lead to adverse effects
How to take Optovite B12 1,000 micrograms Follow exactly the administration instructions of this medication indicated by your doctor
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No adverse effects were reported, but rigorous, large-scale trials are lacking
Hi juanpablo111 It is not uncommon for some symptoms to appear to get worse before they get better as the B12 you are having starts repairing the damage done to your nervous system and your brain starts getting multiple messages from part of the body it had "forgotten about" or lost contact with
How much oral vitamin B12 is required for pernicious anemia