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2013 paper (PMID: 23055539) has an Expression of Concern issued by the journal in 2021, and the Benoist et al

To determine if peptides are working, its important to track both subjective and objective changes in your body

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Reviews from the originating group refer to the peptide having been used in small early-stage human studies in inflammatory bowel disease and other settings with no reported toxicity, but these were limited in size and scope and do not constitute the kind of controlled safety-and-tolerability program (single- and multiple-ascending-dose Phase 1 studies with systematic adverse-event capture) that establishes a human safety profile