Apple cider vinegar — aka ACV — is rumored to help with everything from sunburn and sore throats to headaches and heartburn.

But there are caveats. Most of the studies on apple cider vinegar have been fairly small and, in some cases, poorly designed. So the evidence is not particularly strong or definitive, experts say.

Apple cider vinegar has been all over social media as a health hack, but these are the facts you should know before you start using it.

What to look for in apple cider vinegar pills. Apple cider vinegar pills are a supplement, which means they’re not well regulated by the Food and Drug Administration (FDA).

You may have noticed your supermarket offering more types of vinegar lately. Sure, balsamic and apple cider vinegars are veterans of the condiments aisle, but new shelf neighbors, like coconut ...

And apple cider vinegar typically contains health-promoting bacteria, known as probiotics, that according to studies can nourish your gut microbiome. But there are caveats.