If your coupon is not being applied a notification may pop up explaining the reason as to why it cannot be applied. A notification may not always show. Usually our coupons have restrictions to keep users from applying numerous promotional coupons at once to get their products free. So you might have a coupon such as the GETSTARTED coupon that allows one to get their first autoship order for only $49.99. This is the lowest we can possibly sell the Nootripure products for, so we make it so no other coupons can be applied. Store credit cannot be used with this coupon, but most others it can. If you think there is an error with the coupon system, then please reach out to us and let us know so we can make sure you get the discount you were promised.