Cardiostrong accepts all major credit cards for payment including Visa, Mastercard, Discover and American Express. We take your shopping experience and financial security very seriously. To combat internet fraud, all transactions conducted on our website are encrypted. You can be assured that your financial information will never be retained. Cardiostrong is considered as a Verified Merchant by Authorize.net, one of the largest and safest credit card processors on the internet. In addition to never retaining your financial information, we will never sell your email address or contact information to anyone, for any purpose. If you wish to belong to our newsletter, we would be happy to have you. If you do not, we will not solicit you.