I have within the past year been diagnosed with a histamine intolerance, which finally explains my bouts of uncontrollable drowsiness (to the point where if I stay awake I almost start blacking out) and/or intense migraines that seem to come out of nowhere. I have been able to avoid these symptoms by carefully monitoring what I eat, and especially avoiding slow-cooked meats and dried fruits. However, occasionally something will set the symptoms off unexpectedly. This is where quercetin comes in. When I feel the drowsiness start to come on, I take anywhere from four to ten of these tablets, and it wards off the symptoms. After an hour or two I feel normal again.
As an experiment, I tried taking this quercetin with a few servings of dried fruit. Eating from this exact same bag of fruit previously made me so drowsy I was down for the evening and the whole next day, unable to think clearly or move much, almost unable to see or balance, until I was able to take quercetin. I tried eating the fruit with eight or so of these quercetin tablets, and I experienced only very mild sleepiness. This confirmed to me that they do work for fending off the histamine symptoms.
This benefit was unexpected; I originally bought this product because it's supposed to have solid health benefits. I can't say for sure whether it's working in that regard, but overall I'm extremely glad to have this product and I plan to keep it in my supplement arsenal indefinitely. I believe that anyone with histamine intolerance should try quercetin as a possible remedy.