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It does not provide human subcutaneous exposure data
Oral Supplementation Studies suggest that about 56% of an oral B12 supplement is absorbed, but this is largely dependent on the capacity of intrinsic factor (a glycoprotein released by the stomach that is needed for B12 absorption)
Nan X, Lu H, Wu J, Xue M, Qian Y, Wang W, et al
They are inexpensive, quick to administer, and widely marketed as fat-burning shots
This isnt just a minor detailpicking the right needle and syringe is key to making the injection safe, effective, and as comfortable as possible
If symptoms progress, seek medical care
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