• Cambridge Isotope Laboratories - Manufacturer of stable isotope labeled compounds and some fine deuterated solvents too.
• C/D/N ISOTOPES - Quite a large listing of deuterated compounds and Carbon-13 and Nitrogen-15 labelled compounds. In English or German or French.
• Medical Isotopes, Inc. - Nearly a complete line of enriched biochemicals. Nice selection of fatty acids, enriched with C13.
• NMR Shift Reagents - Supplier of NMR shift reagents.
• Silantes GmbH - Stable isotope labeled biopolymers (H2, C13, N15)

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