Grapefruit seed extract (GSE) has shown to be effective as a broad spectrum anti-bacterial and anti-fungal agent, even anti-protozoan. Although it is not felt to be strong enough to entirely clear an infection, it can help to lower the count in the body either by interfering with the metabolism of the organisms or killing them outright, and is a benign substance.
I take 3 drops of Nutribiotic brand GSE (liquid form) in 4 ounces of water, 3 times a day – the GSE tablets are not as effective. Once I squeeze the 3 drops into the water, I stir it rigorously for 2 minutes so that none of the GSE is left stuck to the glass. I usually take it with food, although you don’t need to.
The times I have stopped taking the GSE I definitely noticed an increase in my symptoms, so, for me, it is a must supplement. GSE has also been shown in vitro (would be nice if we could see its effects in vivo!) to act against the motile and cystic form of borrelia, and so that is another reason I stay on it, besides just the fact that it makes me feel a little better overall. Good luck.