Excellent product. Combined with Bayberry formula, probiotics and vitamin C works wonders for me. I started it after two months treatment with Allicin, which also worked very good (so I didn't experience much of the die-off symptoms). The difference is that GS F in my case works much FASTER than Allicin. I also intent to try Finchley's Oregano formula in the future. BTW, I have systemic candidiasis that almost killed me on several occasions.