ACV worked on my sinus infection although I do not find it palatable in the least. I diluted it in water and still found it to be repulsive : ) but for curing a sinus infection, five stars! However, BEWARE, my 17 year old daughter had been suffering from a sinus infection also and she took it, she ended up in the doctors office much sicker than she already was, she has asthma and apparently ACV is very harmful for asthma sufferers. Hope this article helps!EC: This is the first we've heard about Apple Cider Vinegar being harmful for asthma sufferers. In fact, it is one of the more popular cures on our asthma page. We encourage you to read the feedback on apple cider vinegar as an Asthma remedy.