Thanks, guys! Have you been trying it? In the Braggs book, it describes it in this way: each hair follicle has its own oil can. The oil can gets clogged by this stuff called bottle bacilli which makes the hair stop growing. The acv kills the bottle bacilli and stimulates the oil can for greater activity. They even suggest adding a pinch of cayenne powder with it. (Page 26) I might give that a go, too.