Our team has verified and personally tested the GNC coupon code "PS15" in September 2025, confirming its effectiveness. This code provides the most significant discount benefits when shopping online at GNC.com. Our experts have confirmed that eligible products across various categories—including vitamins, supplements, protein, sports nutrition, and beauty items—receive a $15 discount. To optimize your shopping experience, activate this code. Enter the coupon code "PS15" during checkout at GNC.com. When you add qualifying items to your cart, you'll receive an additional $15 off. We have thoroughly validated this promotional code as the most effective option available for use on a wide range of products at GNC.com.