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doi: 10.3390/molecules191119066
A simple consultation and, when appropriate, lab testing can clarify if injections make sense for you
Low B12 levels can cause fatigue, weakness, shortness of breath, headaches, digestive changes, and other symptoms
One important consideration: a 5mg vial reconstituted with 2mL of water gives you excellent measurement precision at the 1mg dose level (40 units, very easy to read), but the 4mg dose would require 160 units, far exceeding the syringe
There can be excess B12 production when you have too much bacteria
van der Harst P, de Windt LJ, Chambers JC
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