Liver damage can cause pale, yellow stools, as bile salts from the liver usually contribute to the standard brown color of stools
Back Holst, JJ (2007) 'The physiology of glucagon-like peptide 1', Physiology Review, 87, 14009-39
There are also limitations to the study from the Mayo Clinic researchers
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Second, mass spectrometry verifies identity against the expected 1024.2 g/mol parent mass for the Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH sequence
For pharmacokinetic context, see Peptide Half-Life Explained and How Long Do Peptides Stay in Your System