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In some cases, the amount you need might exceed the capacity of your syringe, making it difficult, or even impossible, to measure and inject the right dose accurately
Product Details and Features: Active Ingredient: Cyanocobalamin (Vitamin B12)
Occasional reports mention gastrointestinal upset including nausea
However, for B12, if any part of that complex digestive process is compromised especially the intrinsic factor or the absorption sites in the intestine then a significant portion of the B12 from a tablet might never reach your bloodstream
Unfortunately, studies on this topic have mainly focused on normalising serum B12 concentrations with oral supplementation and should be interpreted with caution since the specific goal of treatment in symptomatic B12 deficiency is alleviating symptoms, and NOT to normalize B12 concentrations in the blood
