According to their website where you order the product you can cancel and prevent billing however if you email the email listed on their website you get an auto responder. If you email the one on their faq page where the auto-respond email sends you http://www.nutralane.com/cs/faq/#50 You will get a bounce back email that says:
Final-recipient: rfc822;
[email protected]
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp; 550 sorry, no mailbox here by that name. (#5.7.17)
Last-attempt-Date: Thu, 20 Aug 2009 01:44:15 +0000
This is a quote taken directly from their website
http://www.gns-online.com/Info/ss16/terms-cond.html
FREE 21-Day Trial Offer Information
To avoid billing call 1-877-242-1376 or email us at
[email protected] for a return authorization number, return the unused portion of the product within the 21 day trial period and never be charged. If you do not cancel, shipments of two 120-count bottles will automatically continue every 45 days from the date of your purchase, and the same credit card will be billed a total of $79.90 plus $3.97 S&H for a total of $83.87.
This company will not issue a return authorization number as quickly as they take your money so you can't return the product "to avoid billing" or cancel the shipment of the next batch for which you will have to pay postage to return. This "sample" is pretty costly.