2 ghk cu serum GHK-Cu Organic Daily Maintenance for Youthful Skin SumaNurica 3 x 0.33 oz
Description
Collagen comparison (thigh skin, 12 weeks): GHK-Cu improved collagen production in 70% of treated subjects, compared to 50% for vitamin C cream and 40% for retinoic acid (PMID 26236730)
Weinheim: Wiley-VCH
Keiser AA, Matazel KS, Esser MK, Feifel D, Prus AJ
They outperformed untreated middle-aged mice
