http://www.webmd.com/diet/apple-cider-vinegar What Are the Risks of Apple Cider Vinegar? continued...
Using apple cider vinegar supplements -- instead of the liquid itself -- adds another layer of risk. You just can't be sure what you're really getting. Unlike medicines, supplements are not regulated by the FDA. They aren't routinely tested for effectiveness or even basic safety. A 2005 study looked at the ingredients of eight different brands of apple cider vinegar supplements. The researchers found that:
* The ingredients listed on the box did not reflect the actual ingredients.
* The ingredients varied a great deal between different brands.
* The recommended dosages varied a great deal between brands.
Most disturbing, the chemical analysis of these samples led the researchers to doubt whether any of these brands actually contained any apple cider vinegar at all.
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