does ghk cu lose effectiveness over time or develop tolerance

dimethyl sulfoxide 99% purity AHK-Cu 50 mg — copper tripeptide, COA per lot | OXpeptides Vitamin b12 Number of Vials:3 Vials (Non-Differentiated Results) PLoS ONE 6 , e22640 (2011) https://www.verywellhealth.com/thmb/f2yRpudCx_J7hSIuoqKt-WckjR8=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/VWH-GettyImages-2218717437-6a4c5c84bdfd46feb41334a30334464d.jpg

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