The Vinegar Institute conducted studies to find out. It confirmed that its shelf life is almost indefinite. Because of its acid nature, vinegar is self-preserving and does not need refrigeration. White vinegar will remain virtually unchanged over an extended period of time. And, while some changes can be observed in other types of vinegars, such as color changes or the development of a haze or sediment, this is only an aesthetic change. The product can still be used with confidence. "
All I can add is that I have eaten "foggy" vinegar that had sediment and did not get sick.
btw, check out the recipes at the Vinegar Institute web site, especially the hints at the bottom! Good info!
Thanks wasabi......I almost bought more the other day because I was thinking about throwing mine out.....haven't used it in prob. 6 months.....good thing the better 1/2 of my brain won out and saved me money.