the evil, vile grapefruit seed extract (GSE)

There are certain topics that make me rant, pretty much every time they come up... one of these is GSE - grapefruit seed extract.  It's sold as a "natural antimicrobial/preservative" but in truth is adulterated with horrible, awful, dreadful, deplorable, revulsive chemicals that are carcinogens, endocrine disrupters, allergy sensitizers, and environmental pollutants. 

GSE is not safe to ingest, it's not safe to put on your skin, and it's not even safe to use in any manner where it will be released into the environment.  Please don't use it for parasites, don't use it as an ingredient in "natural detergents" (Bio-Kleen uses GSE), in soaps and by no means expose your infants to it to "fight thrush".  Most GSE is more heavily laden with chemicals than Lysol (thanks to Todd Caldecott for that tidbit).

GSE Overview (todd caldecott)

Grapefruit Seed Extract Explained (kathy abascal)

Grapefruit Seed Extract. Natural or synthetic? (rob mccaleb)

Simultaneous identification and quantification by liquid chromatography of benzethonium chloride, methyl paraben and triclosan in commercial products labeled as grapefruit seed extract

Several more scientific references on adulteration...
http://www.yesyesyes.org/GSE.htm ...yes, I know that's a sex lube site, but no, I have no idea whether it's good or not.  I encourage you experiment to your hearts delight (and with your hearts delight)