Zen cortex is backed by a 100% money back guarantee, 60 full days from your original purchase. If you’re not totally and completely satisfied with the product, your results or your experience in the first 60 days simply let us know by calling our toll free number or dropping us an email and we’ll give you a full refund within 48 hours of the product Abeing returned. That’s right, simply return the product, even empty bottles, anytime within 60 days of your purchase and you’ll receive a full, no questions asked refund (less shipping and handling).