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Lancet Neurol
If you find yourself forgetting things more than usual or struggling to stay sharp, a B12 injection could make a noticeable difference within days
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While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says
And my B12 wasnt normal. I had Pernicious Anemia , a life-threatening autoimmune condition that prevents the body from absorbing and metabolizing vitamin B12
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