Lung Trust comes with a 100% money back guarantee - 90 full days from your original purchase. If you're not totally and completely satisfied with our product or your results within the first 90 days simply let us know by calling our toll-free number or dropping us an email and we'll gladly give you a� full refund within 48 hours� of the product being returned. That's right - simply return the product, even your empty bottles, anytime within 90 days of your purchase and you'll receive a full, no-questions-asked refund (minus shipping and handling fees).