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Studies show they improve pregnancy rates

It participates in the modulation of the activity and localization of numerous enzymes and receptors [147, 160, 161], takes part in the regulation of many physiological processes in the brain [147, 162], including synaptic plasticity [163, 164], axonal elongation, and neuronal survival [147, 165]

Many users report that the benefits continue to build over time with consistent use

Ferroptosis: a new strategy for Chinese herbal medicine treatment of diabetic nephropathy

A widely cited microarray screen reported that GHK exposure of human fibroblast cultures altered expression of more than 4,000 genes, with pathway analysis identifying TGF-, integrin, and ubiquitin-proteasome signaling as enriched among GHK-responsive transcripts