CIL is the world leader in the manufacture and separation of stable isotopes and stable isotope labeled compounds. For the past 25 years, CIL has been committed to providing the highest quality products coupled with unsurpassed service to researchers worldwide. CIL offers the largest inventory of stable isotope labeled compounds including NMR solvents, gases, amino acids, Bio-Express Cell Growth Media, RNA/DNA products, metabolites, fatty acids, sugars, metals, NMR references standards, buffers, forensics, 18O water and environmental contaminant standards. Our unmatched selection of stable isotopes and labeled compounds has contributed to advancements in chemistry, biochemistry, environmental analysis, physics, biomedical and diagnostic research.