Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
High-dose quercetin protects against colds - if you're 40+ and fit
If you are no longer very young but still fit, then supplementing with a high dose of quercetin may reduce the chance that common cold viruses make you ill. This is apparent from a somewhat older study, which in this dark age has become even more interesting for some of our readers than it already was.
The researchers used a combination of quercetin, vitamin C and niacin.
Vitamin C and niacin would increase the bioavailability of quercetin, according to manufacturer of the supplements the researchers used. The subjects in the 'low-dose' experimental group took 500 milligrams of quercetin, 500 milligrams of vitamin C and 20 milligrams of niacin daily, the subjects in the other experimental group took 1000 milligrams of quercetin, 1000 milligrams of vitamin C and 40 milligrams of niacin on a daily basis.
During the 12 weeks that the experiment lasted, the researchers recorded how many days the subjects had a cold and how serious the symptoms were. To put it in medical jargon, the researchers looked at symptoms of upper respiratory tract infection.
Using questionnaires, the researchers determined the subjects' weight, fitness, education level and quality of diet.
In this group, supplementation with one gram of quercetin per day reduced the number of cold days as well as the severity of the infection by about a third.
The researchers do not understand how this is possible. Fit people catch a cold less often than non-fit people. Why would the protective effects of quercetin manifest themselves in this low-risk group in particular?
Quercetin can mitigate this effect. The studies on which we base this bold statement are at the bottom of this page.