I have to thank Tim Ferriss' recommendation for this Vitamin C. Thought I saw it on his blog or email. I got this on a whim after reading his post, but forgot all about it in my medicine cabinet. About a month later, my Mom had a Stroke and was in ICU and hospital for 5 days. I mixed two of these, as well as two EmergenCs in her water while she was in the hospital, and she beat a cold coming on. Around the same time, my 9 year old son started coughing, he said a lot of his classmates were coughing and wheezing, so I gave him 1/2 packet 1/2 packet of EmergenC twice a day for 4 days. I gave the other half to his 7 year old brother so he doesn't catch it. My 9 year old only coughed a little bit and was over his cough and cold in 3 days. The 7 year old never got it. My husband also had a month long cough, and I gave him 1 packet of this, plus 1 packet EmergenC twice a day for approx 4 days also. Beat his cough. So, I think this stuff works. None of us could afford to get sick around my Mother, so Lypo-Spheric Vitamin C saved all of us. Since it's expensive, I plan to give my family this Vitamin C cocktail twice a week, then do twice a day if we're catching a bug. I also read the 1000 Amazon reviews, and I let the alcohol out by opening the packet and leaving it out for 8-15 minutes before drinking. Will also make sure we do the twice a day dosage when traveling. ** Quick note--we have autoimmune issues in the family, and a great doctor here told us to take Clinical Strength Culturelle--the 15 billion kind. Our family member takes that twice a day, plus the twice a week Vitamin C here, and is doing great