A peptide that dissolves perfectly in water can still fall out of a finished serum once electrolytes, preservatives or a change in pH are introduced. A spec sheet describes the raw material, not your formula.
Test in the real base
Run solubility and clarity checks in the actual base with the full preservative system, then repeat after freeze-thaw cycling and accelerated storage. Assay the peptide again after storage rather than assuming the initial dose survived.
Watch the usual interactions
High salt levels, chelating agents, strongly acidic or alkaline systems and certain surfactants are the usual causes of loss. If your formula contains any of them, test a small panel before committing to a bulk order.
Request a sample with its batch COA and run these checks in your own system. We can share typical compatibility observations for the grade you are evaluating.