b12 by injection Injections made form of vitamin B12 How to Give a B12
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But it's still worth optimizing as part of a broader strategy
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You need to have an intrinsic factor, a protein made by cells in your gut lining to bring B12 into circulation, transcobalamin proteins to move it around the body and finally, pancreatic enzymes for absorption
Some patients report a firm feeling to skin, but no visible swelling
