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doi:10.1002/pro.5560061218

Mistake 5: not cleaning the vial stopper The rubber stopper on your vial has been exposed to air, shipping environments, warehouse dust, and your hands

As with many trending ingredients, there is some real science behind GHK-Cu, but there is also a lot of exaggeration

This means our products lack the additional stabilizers found in cosmetic formulations, placing the onus of proper storage squarely on the researcher