Cambridge Isotope Laboratories, Inc. (CIL) is the world's premier producer of stable isotope labeled compounds and the world leader in the field of isotope separations with an annual production capacity of 120 kilograms of Carbon-13 and annual production capacity of 250 kilograms of Oxygen-18. For more than 20 years, CIL has specialized in the development, production, and marketing of stable (non-radioactive) isotopes and chemical compounds labeled with stable isotopes. With an inventory of over 8000 products, CIL has the most complete product offering of stable isotope labeled compounds available.