Research Use Only (RUO)
A labelling designation indicating that a product is intended solely for laboratory research and is not approved for diagnostic, therapeutic, or human use. Many peptide compounds in the research space are sold under RUO labelling, which restricts their legal use to scientific investigation.
Technical Context
RUO products are exempt from the regulatory requirements (GMP manufacturing, clinical trials, marketing authorisation) that apply to therapeutic drugs. However, this exemption is conditional: the product must genuinely be intended and sold for research purposes only. Regulatory enforcement targets: products marketed as RUO but sold in quantities, packaging, or through channels clearly intended for human self-administration; products with marketing materials containing therapeutic claims (disease treatment, symptom relief); and websites providing dosing, reconstitution, and injection instructions alongside RUO labelling. The RUO classification exists in regulatory frameworks for diagnostics (21 CFR 809.10(c) for IVD products) but is applied analogously to research chemicals. For peptide compounds, the RUO label is the primary legal mechanism enabling sale of compounds that have not undergone clinical trials — but it provides no quality assurance for manufacturing standards, purity, or safety.