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3 to 7 days Clearer thinking, steadier mood, more stamina 2 to 4 weeks Steadier energy and more consistent day-to-day benefits 2 to 3 months+ Longer-term support for nerve function and steady Why a Shot Works Faster Than Oral Supplements When you swallow a B12 pill, it has to travel through your stomach and small intestine and rely on a protein called intrinsic factor to be absorbed
Most vitamin B12 injections dont pose the risk of side effects
However, serum levels were higher in people prescribed valproate
Lakshmi Narayanan, and Rajiv D
Wellington, New Zealand, 1998
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