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Not just absorption speed, but tissue distribution, half-life extension, and whether the peptide reaches dermal fibroblasts at concentrations high enough to activate matrix metalloproteinase regulation

Each targets specific tissue systems through gene expression modulation, potentially creating synergistic anti-aging effects when combined thoughtfully

No human study has ever tested this

Furthermore, researchers were unable to identify the DSIP gene, a precursor protein, or a specific receptor for the peptide