GNC.com accepts a variety of payment methods to cater to the needs of its customers. Customers can typically use major credit cards such as Visa, MasterCard, American Express, and Discover. Additionally, GNC.com may allow payments through PayPal, an option that many consumers appreciate for its convenience and security. For those who prefer to use store gift cards, GNC also accepts these as a payment method for online purchases. It is important to note that while these are the commonly accepted payment methods, they may vary based on specific promotions or updates to the website. Therefore, it is advisable for customers to check the current payment options available directly on the GNC.com website before making a purchase.