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For research-grade GHK-Cu, buyers should expect a purity rating of 99% or higher, indicating the absence of manufacturing impurities, heavy metals, or degraded by-products

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Although NEM reacts with thiols by a very fast Michael addition reaction at neutral or slightly acidic pH, this reaction is reversible, and an excess of NEM should be used to avoid the possible migration of the maleimide group among different thiols 3