Well I didn't find it per say, but I started to do it. I get some nasty headaches once a week. Usually they are caused by the kidneys are disturbed by the emotions and it means the body is off-balance. The fast working malic acid of Apple Cider Vinegar can help relieve headaches by aiding the kidneys to return the urine to normal acidity.
I just had one of the worst in a month. Took two table spoons of braggs apple cider vinager and it was gone within 5 minutes. Like gone gone..
Try it out of you get them too. You can get the stuff at any health store or online.