My guess is that when candida dies off/produces harmful toxins the immune system produces more histamine due to the inflammtion response. So taking an anti-histamine might reduce some of the histamine from the immune response. Did you take a drowsy or non-drowsy formula. Intersting that you tried a anti-histamine. I was thinking about trying a non-drowsy anti-histamine out of curosity to see if it cuts down on the inflammtion response.
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