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As an additional example to that of the trefoil peptides noted above, the peptide EGF (epidermal growth factor) is produced in human milk to promote growth of the gastrointestinal tract in newborn infants, but the same peptide aggressively stimulates the growth of breast cancer cells in adults

GHK-Cu is a copper-binding peptide research compound supplied exclusively for use in controlled laboratory and analytical environments

They supported this by conducting an in vivo experiment that demonstrated reduced levels of reactive oxygen species (ROS), increased superoxide dismutase 1 (SOD 1) and glutathione (GSH) levels, greater telomerase activity and telomere length, and an increased number of ovarian germ cells (71)

This is more concentrated but less beginner-friendly