Rebuilding a freezer inventory is rarely a glamorous job. It is a reconciliation exercise: racks out, vials counted, labels read under good light, and every tube matched to a document that explains what it is, when it expires and what testing sits behind it. That is exactly the moment when phrases such as “heavy-metal screened” stop being reassuring and start being testable. Either the screening is evidenced in batch documentation, or it is a slogan. For laboratory researchers and materials managers working with research-use-only materials, that distinction matters. Research Sciences supplies high-purity research peptides, laboratory accessories and preparation tools strictly for controlled in-vitro scientific research. None of the materials are…