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Quality matters but it's a commodity product
Skin tingling (topical use) When applied to the skin, GHK-Cu can cause a mild tingling or warming sensation
Choice of formulation is therefore guided mostly by clinical goals, availability and cost
It takes between 7 to 10 working days for US customers, and between 3 and 5 working days for customers in Europe
Researchers commonly choose bacteriostatic water for peptide reconstitution because it contains 0.9% benzyl alcohol, which helps inhibit bacterial growth during repeated withdrawals from the same vial
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