Expensive, but for my work, I travel to multiple regions, dry, hot, or moist, humid environments, working outside all day. I have asthma...this product helps clear my lungs quickly..very rarely need my inhaler anymore, altho I always bring it with me...also use it as an AEC stack working out..boosts my performance and endurance. Hard to find good, quality products anymore because of the FDA restrictions...but this is a quality product.