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FGF family members are classified according to their affinity ligands and tissue distribution

While tirzepatide itself is not absorbed through the gastrointestinal tract (it's given by subcutaneous injection), delayed gastric emptying caused by the medication can affect how quickly oral supplements are processed

[DOI] [PMC free article] [PubMed] [Google Scholar] 15.Boelens P.G., van Leeuwen P.A., Dejong C.H., Deutz N.E

Scientific research also shows that piperine, the active ingredient of black pepper, increases the absorption of substances that are difficult to absorb

Sources: NIH, National Library of Medicine, PubMed - Vitamin C in dermatology