Posted by iHerb Customer on Nov 17, 2008 | Verified Purchase
As a physician, I get lots of coughing in my face on a daily basis. I read a review of Umcka in one of my journals, which cited a statistically sound study showing the beneficial effects. I have used it twice so far this year when I started with cold symptoms, and the virus lasted less time and was much less severe. I bought extra to keep on hand! I have had much less success with several products (effervescent tabs, nasal swabs) bought at my local drugstore, so I will continue to order this.