I had some of this stuff lying around and was thinking to myself, "I've had this sinus infection for a couple months now. Is there any kind of immune booster I can take to push me over to complete remission?" I took one scoop of this and an hour later I felt a bunch of phlegm run down my throat. Now mind you, I've done just about everything. Probiotics in my nose, humidifier, probiotic lozenges, Ear infection treatments. It was bad enough that I was constantly dizzy, had a fever (though that went down), and malaise. But this really helped me more acutely than anything else. It's not a cure, but it's a powerful weapon in your arsenal if you want an immune system boost