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Because if radioactively-labeled B12 is squirted into peoples rectums, they dont really seem to absorb it
Eftekhari, S
Fibroblasts, harvested from human venous ulcers and pressure ulcers, grown in cell culture have features of senescence [32,33]
As soon as a compound attracts positive press, copycat vials claiming to contain it show up on grey-market sites, almost always stamped "not for human use" or "for research use only"
Vitamin B12, a crucial water-soluble vitamin, plays a vital role in various bodily functions, including energy metabolism, red blood cell production, and neurological health
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