Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

USP Standards

All USP Reference Standards are provided as delivered and specified by the US Pharmacopeia. All information provided in support of these products, including SDS and any product information leaflets have been developed and issued under the Authority of the USP.
For further information and support please go to the website of the US Pharmacopeia