T&T supply a large range of Certified Reference Standards and Chromatography Products from a number of leading manufacturers including LGC, Chem Service, Chromadex, Witega, Chiron, CDN Isotope, European Pharmacopoeia (EP), TRC, Accustandards, NIST, Sigma Aldrich, Fluka and Supelco,  Wellington Laboratories, YMC and Nacalai