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A retinoid-naive person in their forties with significant photoaging may still benefit most from tretinoin, but starting with GHK-Cu for a few weeks to build tolerance is a sensible on-ramp
No strong clinical evidence shows that GHK-Cu reverses grey hair
Diabetes Nutr Metab 12:271276 Cummings EA, Sochett EB, Dekker MG, Lawson ML, Daneman D (1998) Contribution of growth hormone and IGF-I to early diabetic nephropathy in type 1 diabetes
Topical GHK-Cu is usually well tolerated, but some patients may notice mild irritation or redness, especially after procedures or with strong actives
specialized equipment required, less relevant for metabolic indications