Yuck! I'm going to check this out, it sounds fishy to me.

Okay, here is the general observation from the article at WebMD, it agrees with the others I browsed:

"The answer depends on how you want to use apple cider vinegar. As a salad dressing, you should be fine. But taken as a daily medical treatment, it could be a little more risky. Yes, some studies of applecider vinegar are intriguing. But a lot more research needs to be done. Right now, there is not enough evidence that apple cider vinegar -- or any vinegar -- has any health benefit for any condition. Since the benefits are unknown, so are the risks.

If you're thinking about trying apple cider vinegar, talk to your doctor first. It's always worth getting an expert's advice. Your doctor can also make sure that the apple cider vinegar won't affect other health conditions or the effectiveness of the medicines you take. Trying to control a serious medical condition on your own with an unproven treatment is both unwise and dangerous."

I'd recommend reading the whole article, it offers a good amount of information on the benefits and risks of using apple cider vinegar as a dietary supplement:
http://www.webmd.com/diet/apple-cider-vinegar