The head-by-head comparison between the three interventions was made only in one paper of the included studies
It is not the dose
Mechanistically, the peptide perturbs the FOXO4 interaction with p53, which selectively causes p53 nuclear exclusion and cell-intrinsic apoptosis (Figure 2, this novel senolytic did remove cells from the PDL9 chondrocytes, which was accompanied by significantly reduced levels of SA--gal staining

Technical Specifications Compound: Glycyl-L-Histidyl-L-Lysine Copper Complex (GHK-Cu) Format: Lyophilized peptide powder Strength: 50 mg per vial Purity: 9899% (COA included) Appearance: Blue-tinted lyophilized powder Category: Research peptide reagent Intended Use This product is intended solely for: Laboratory experimentation Controlled in-vitro research Molecular and biochemical pathway studies Metal-peptide interaction research Non-human preclinical modeling Academic and institutional scientific projects Not intended for: Human or animal consumption Injection, ingestion, inhalation, topical, or cosmetic use Medical, therapeutic, or dermatological applications This material is not approved by Health Canada, FDA, or any regulatory body for clinical or cosmetic use
Inhibition of food iron absorption by coffee