Website Help System


Important Things to Note:

  • Users may register at any time by clicking on the New user? Start link under Account on the site header.
  • Guest shoppers will be required to log in or register when a cart is submitted for purchase.
  • Required fields are indicated with a red star/asterisk or as part of the form instructions.
  • Users must be registered and logged in to place orders.
  • If you are required to create a Login Name, you will not be able to modify or change that name.
  • If you forget your Password, click on the Forgot Password or Password Reset link on the Login page.
  • If you forget your Login Name or User ID, please contact your local office.

Security Question:

If you were required to provide a Security Question and Answer when you registered, it may be used when requesting a forgotten Password and/or Login.

During the password reset process the question and answer you chose on your profile may be requested. Please input the information as requested.

Once validated, the system will send an email to the email address contained within your profile. (You may be requested to only submit your email address and Username). The system generated e-mail will require you to login with a new Password.

If there is more than one profile associated with an email address, additional steps are needed to complete the password/login recovery process. If this is the case, a system generated e-mail has been sent that will be sent containing all of the logon ids that are associated with your email address. Select the appropriate one and restart the Password Reset process.

If additional assistance is needed, please email us at for assistance.

PIN #:

The PIN (Personal Identification Number) is designed specifically for you to make ordering by phone faster and more convenient.

Your PIN can be created quickly and easily by any Customer Service Representative while taking your order. When placing future orders using your PIN, all shipping information specific to you is contained within the PIN, allowing us to proceed with taking your order immediately. This capability makes it even easier to do business with Sigma-Aldrich.

Credit Card Reference / Security Code:

The card identification number is recorded as an additional security precaution and is located either on the face or back of the card (see specifics below).

Amex: 4 digit, non-embossed number printed above your account number on the face of your card.

Visa: 3 digit, non-embossed number printed on the signature panel on the back of the card immediately following the Visa card non-embossed last four digits of the account number.

MasterCard: 3 digit, non-embossed number printed on the signature panel on the back of the card.