Great info and completly safe to take in large amounts.

http://pureliquidgold.com/

Large artical ... here is small sample...

Grapefruit seed extract is nontoxic. According to an independent laboratory testing "Acute Oral Toxicity", it would take at least 4,000 times the normal dose of gse to produce a 50% chance of poisoning (called LD50). Because grapefruit seed extract is non toxic and does not exhibit the harsh side effects and high cost of pharmaceuticals it is becoming the alternative health choice for naturopathic physicians, clinics and the general public.

How Does Grapefruit Extract Work?
According to studies, the activity of the active ingredient of grapefruit seed extract appears to develop in the cytoplasmic membrane of the microorganisms. The active ingredients of the extract disorganize the cytoplasmic membrane, thereby preventing the uptake of amino acids.

At the same time, there is a leakage of the cellular contents with low molecular weight through the cytoplasmic membrane. The pathogen is then inactivated. The time for this is generally shorter than that of most comparable preparations.

Grapefruit seed extract does not allow germs to build up a resistance. Due to the mode of its activity it is believed that this resistance is impossible as grapefruit seed extract disrupts the organisms cytoplasmic membrane.

What is not known is how Grapefruit-Seed-Extract can affect the cell membranes of such a diverse group of microbes with virtually no toxicity toward animal life (The "Acute Oral Toxicity Study" performed by an independent laboratory concluded that you would have to take 4,000 times the normal adult dose to risk a 50% chance of poisoning). And to complicate matters further, since viruses do not have a cell membrane of their own, how is it that Grapefruit-Seed-Extract can act as a remedy as it does.

AT THE BOTTOM OF THE PAGE IT HAS LINK... which will have some people screaming.. for I have heard their yells.. but hay worked for us.. we are well !

http://pureliquidgold.com/acid-alkaline-forming-foods.htm