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Cell 179 , 923936.e11 (2019)

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The material supplied by Koi Peptides is synthesized independently for in vitro laboratory research only not formulated, packaged, or labeled for human use, not equivalent to any approved drug product, and not authorized for any human or veterinary indication

But an in-vitro permeability score is not the same as a measured oral bioavailability figure in an animal, and it is certainly not evidence of a human effect

Some medications can also affect absorption of Vitamin B12 in the gut, and B12 deficiency can be an issue if you have had weight loss surgery