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Rat studies have noted embryofetal mortality, structural abnormalities, and alterations to growth at maternal exposures below the maximum recommended human dose (MRHD) based on exposure AUC

Full and distended stomach, and vascular response Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data Orally Targeted Delivery of Tripeptide KPV via Hyaluronic Acid-Functionalized Nanoparticles Efficiently Alleviates Ulcerative Colitis PepT1-Mediated Tripeptide KPV Uptake Reduces Intestinal Inflammation doi: 10.1002/ibd.20334

So these are prescription peptides for specific purposes

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Endothelial Protection