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vitaminology 61 (2), 182187

In double-blind, placebo-controlled trials, daily application of GHK-Cu cream at 3% concentration for 12 weeks produced a 70% increase in skin collagen thickness as measured by ultrasound imaging, a 40% increase in skin elasticity, and visible reduction in fine lines and wrinkles

With annual production capacity exceeding three thousand tons and more than one hundred fifty trained technicians overseeing operations, Shaanxi Hongda Phytochemistry maintains consistent supply chains capable of fulfilling orders ranging from small sample quantities to metric ton purchases

Most studies have sample sizes of fewer than 100 participants