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They concluded that no men experienced a change in semen parameters but their hormone levels rose during the treatment

Do not use within 6-8 hours of bedtime

That work reported that GHK at nanomolar concentrations significantly modulates the expression of more than 4,000 human genes roughly one-third of the known human genome, as documented in NIH-indexed genomics research

Psychoneuroendocrinology 164 , 107006

For example, miR-223-3p in LPS-stimulated extracellular vesicles (LPS-EVs) enhances Hippo signaling by targeting MEF2C, thereby promoting autophagy and ferroptosis in alveolar macrophages and aggravating S-ALI (Ye et al., 2025)