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I don't know if this might be spoiling a future story, but I think it's fine, because it turns out it's incredibly hard to test them

The Pyo 2007 study showed AHK-Cu produces stronger dermal papilla cell proliferation and follicle elongation than GHK-Cu at equivalent concentrations

J Neurosci Off J Soc Neurosci

Thus, expectations for the overall magnitude of effect from a given agent might be modest when treating patients whose baseline A1c is 30 pioglitazone reduced HbA1c levels better than sitagliptin while in individuals with a BMI 90 canagliflozin lowered HbA1c better than sitagliptin while in individuals with an eGFR between 60-90 sitagliptin was more effective (13)