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

For Domestic Requests (US and Canada) email: cilsales@isotope.com

For International Requests (outside US and Canada) email: intlsales@isotope.com

For Accounting Requests (Invoices/Payment Inquiries) email: ar@isotope.com

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.