IsoSciences
- Custom stable isotope labeling and small scale organic synthesis including the preparation of metabolites and PET precursors and standards.
- http://www.isosciences.com/

U.S. DOE Isotope Programs
- Information about U.S. Department of Energy production of isotopes programs.
- http://nuclear.gov/isotopes/neIsotopes2a.html

Icon Services
- Supplier of compounds labeled with stable isotopes.
- http://www.iconisotopes.com

Hartmann Analytic GmbH
- Supplier of radio-labeled chemicals, products for radiation protection. Also offers labeling-services and custom synthesis.
- http://www.hartmann-analytic.de/

CNL Scientific Resources, Inc.
- A supplier of isotopes, metals, crystals and other engineered materials to manufacturers of pharmaceuticals and instruments.
- http://www.cnlscientific.com/

Center of Molecular Research
- Representative of a Russian producer of Oxygen-18 water situated in Saint Petersburg
- http://www.h2o18.com

Isotec
- A member of the Sigma-Aldrich family, manufacturer of stable isotope labeled compounds.
- http://www.sigmaaldrich.com/Area_of_Interest/Chemistry/Stable_Isotopes__ISOTEC_.html

Proftec
- Supplier of pure Copper powder.
- http://copper.h12.ru

U.S. DOE Isotope Production and Distribution
- U.S. Department of Energy isotopes catalog. Quite an extensive list.
- http://www.ornl.gov/sci/isotopes/catalog.htm

Isoflex
- Stable isotopes for use in science, medicine and industry from Russian producers.
- http://www.isoflex.com/

PerkinElmer Life and Analytical Sciences
- Radiochemicals including radiolabeled ligands, P32, amino acids, macromolecules, microspheres, precursors, and radionuclides
- http://las.perkinelmer.com/catalog/Category.aspx?CategoryName=Radiochemicals

Wellington Laboratories
- Produces 12C and 13C halogenated reference standards of environmental concern, including chlorinated and brominated dioxins, furans, biphenyls and diphenyl ethers. Includes corporate and product details, online catalog and contacts.
- http://www.well-labs.com/

Techsnabexport
- Supplier of Russian-produced radioisotopes and labeled compounds.
- http://www.tenex.ru/

Omicron Biochemicals Inc.
- Supplier of single, multiple and uniform stable isotope labeled saccharides and nucleosides (13C, 2H, 15N, 18O).
- http://www.omicronbio.com/

Hyox18
- Isotope O18 enriched water used to produce fluoro-deoxyglucose for PET.
- http://www.hyox18.com/

ViTrax Radiochemicals
- Manufactures Tritium, Carbon-14, and Sulfur-35 radiolabeled products and offers custom radiosynthesis under cGMP.
- http://www.vitrax.com/

STB Isotopes
- Stable isotopes for science, medicine and industry, a list of some rare and unusual stable isotopes.
- http://www.stb-isotope.com/

International Isotopes Clearing House, Inc.
- Catalog listing of radioisotopes, 14C- and 3H-labeled compounds for medical research, 33P- and 125I- available.
- http://www.iichinc.com/

Chemgas
- Chemgas supplies high purity rare gases and isotopically enriched gases.
- http://www.chemgas.com/

Advanced Materials Technologies Ltd,
- AMT, supplies stable isotopes, deuterated solvents and high purity materials for medical and chemical research.
- http://www.isotope-amt.com

RITVERC GmbH
- A producer and worldwide supplier of radioisotope products for science, industry, and medicine. Product list includes radiation sources, labelled compounds, stable isotopes, and radiopreparations.
- http://www.ritverc.com/

Spectra Gases
- Specialty gases for high technology markets. Our core business is pure gases and gas mixtures for excimer lasers and lamps. Isotopic en-richment of gases for research.
- http://www.spectra-gases.com/

PicoTrace
- Equipment for trace element and isotope analysis.
- http://www.picotrace.de/

International Isotope Society
- The IIS provides a forum for all chemists involved in radiochemical synthesis and analysis to obtain and share information outside of their immediate area of employment and expertise.
- http://www.intl-isotope-soc.org/

Moravek Radiochemicals
- Manufacturer of tritium and carbon 14 labeled radiochemicals for AIDS and cancer research.
- http://www.moravek.com/

Radioisotopes in Medicine
- Stable and unstable isotopes are covered.
- http://www.uic.com.au/nip26.htm

MDS Nordion
- Radioisotope technology used to prevent, diagnose and treat disease. Products and services include nuclear medicine, radiation therapy for cancer, irradiation sterilization and food irradiation.
- http://www.mds.nordion.com/

Martek Biosciences
- can supply isotopically enriched biochemicals
- http://www.martekbio.com/