Researchers buying peptides online for laboratory research should treat peptides as research-use-only laboratory materials, not consumer products. For laboratory purchasers, key considerations include peptide identity, purity documentation, batch-specific certificates of analysis (COAs), batch traceability, product labelling, analytical testing, product format, storage information, and supplier transparency. This guide focuses on controlled research procurement through Golden Age Peptides and how to evaluate peptide sourcing while keeping the discussion limited to documentation, quality review, and research-use-only purposes.