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It depends on the research question

Improper storage causes irreversible peptide degradation: temperatures above 30C denature protein structure within 2 hours, freezing reconstituted peptides creates ice crystals that aggregate peptide molecules, and storing lyophilised vials in humid environments introduces moisture that hydrolyzes peptide bonds even before reconstitution

One study found that the total amount of Melanotan II in vials ranged between 4.32 and 8.84 mg, although each [seller] claimed that vials contained 10 mg Melanotan II. Advertisement The same study found that as much as 6% of some Melanotan II products were made up of unknown impurities. And again, inhaling them through your nose means these chemicals have direct access to your bloodstream

Both peptides also appear in larger pre-mixed blends that add GHK-Cu and, in one case, KPV, and the KLOW vs GLOW comparison covers how those two formulations differ