Thank you for taking time to look at quercetin. I read it could further damage kidneys at higher dosages which is why I am trying one half dose.

Yes problem with histamine is an ordeal although of the possible related symptoms I have only two major at this time: severe full face breakout controlled by histamine diet and intense whole body itching primarily at night as histamine highest at that time for which quercetin is ranked highest. I do take Zyrtec and claratin daily recommended by an allergist. Of the 3 dermatologists. One allergist, one gastro, and my PCP I have seen none of them have dealt with the 1% of the population who experience histamine intolerance. I will continue to search on line and perhaps find a study on it. Have a Histamine Intolerance Explained book that covers available supplements and a list of most foods high in histamine. Avoiding a wide range of specific foods does control facial breakout which is damaging to the skin and possibly eyes as well as painful.