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For deficiency without neurological involvement or for borderline levels, oral supplementation with high-dose cyanocobalamin (1000-2000 mcg daily) is often effective, as approximately 1% of an oral dose is absorbed through passive diffusion even in the absence of intrinsic factor
However, it isnt possible to know exactly how much B12 you are receiving this way
Research on glycine supplementation shows modest benefits for collagen synthesis and some metabolic parameters
A popular claim about B12 shots is how they might aid in losing weight
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