I bought grapeseed extract about two weeks ago, started taking it, and immediately began to feel terrible. Foggy head, irritable, very tired. Then I noticed very thick, clear mucous coming out of nose and the same in the back of my throat, to the point that I was constantly swallowing to clear it out of my throat. When I developed the same thick, clear mucous as a (excuse this bit of TMI) vaginal discharge, I first thought I had PMS, then I became suspicious. I checked the ingredients on the Grapefruit-Seed-Extract bottle and found out that it had YEAST in it. Yeast! I stopped taking it and all the symptoms cleared up.