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Customer Service: 1-800-322-1174 ; Main Number/Reception: 1-978-749-8000

For Domestic Requests (US and Canada) email:

For International Requests (outside US and Canada) email:

Note: when emailing either of the email addresses listed above, please be sure to include your complete contact information, including company, address and phone number. It is also helpful to include an  Application Area of Interest such as any of the following: MS, NMR, NMR + MS, Environmental, Environmental + MS, Trace Element Analysis, Breath Test, CTM, Custom Synthesis, Deuterium, Forensics, Gases, Nuclear Medicine.

For Accounting Requests (Invoices/Payment Inquiries) email:

Cambridge Isotope Laboratories, Inc.
3 Highwood Drive
Tewksbury, MA 01876

CIL Account Coordinators are available from 8:00 A.M. to 5:00 P.M. Eastern Standard Time Monday through Friday.