In a teaching lab, reproducibility is rarely lost in a dramatic failure. It slips away when a methods section names a reagent but not the batch behind it, or when a demonstrator repeats a protocol with a vial whose documentation cannot be matched to the one used last semester. For research-use-only materials, batch documentation is part of the method, not an administrative appendix. Research Sciences supplies research peptides and laboratory accessories for controlled in-vitro work, and its published model of batch-level CoAs and product-linked records shows how teaching labs can treat documentation as a methods fixture. All products are for laboratory research only; they are not for human or veterinary…