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A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default

Plant Physiol 170: 17451756 Chan KX, Wirtz M, Phua SY, Estavillo GM, Pogson BJ (2013) Balancing metabolites in drought: the sulfur assimilation conundrum

"The Effect of TripeptideCopper Complex on Human Hair Growth In Vitro." Annals of Dermatology, 2007

Vitamin requirements of elderly people: an update

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