I've started using it for a week and first time hit me like a January -10 degrees breath on mountain, and my nasals felt so relieved. I think all my life I've intake only 60-70% of the air I should take. I've started sleeping better, speaking louder (have no idea what impacted this) and running longer with less effort on my lungs. There's no way this is Placebo. If you have something like a deviated septum, this is something I would recommend!
I bought it locally, but there should be on Amazon or all major marketplaces!