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One reason for this difference is that there are different kinds of B12 injections, each working for a long time
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
For example, a study conducted by Hsieh et al
Weight Loss Support: B12 injections are sometimes used as part of weight loss programs, although they are not a standalone solution for weight management
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