Water-based GHK-Cu serums retain 80% or more activity for 24 months when refrigerated at 28C after opening, dropping to 6070% activity within 48 weeks at room temperature due to peptide bond hydrolysis and copper oxidation
Toxicol Lett 178(2):7176 Sawaf H, Thomas G, Taliercio JJ, Nakhoul G, Vachharajani TJ, Mehdi A (2022) Therapeutic advances in diabetic nephropathy
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The study found significantly different levels of 19 species of gut bacteria in fibromyalgia patients as compared to controls