For dull hair and dandruff… I use apple cider vinegar as my hair conditioner. —Jennifer Lynn Doctor’s tip: Its astringent properties make hair look shinier, but apple cider vinegar can also treat dandruff by reducing the growth of the fungus Malassezia furfur.  For bad breath… A capful chased with water dispels onion breath. —Cindy McDaniel For troubled skin… Dampen a cotton ball and hold on a pimple for 5 minutes. It reduces blemishes quickly. —Caroline Atkins  For heartburn… I take a teaspoon of cider vinegar for heartburn. It stamps it right out. —Sarah Heatherly Doctor’s tip: Consume no more than 2 tablespoons of vinegar in 8 ounces of water.  *These reader suggestions have been reviewed by Lyla Blake-Gumbs, MD, an alternative medicine specialist at Cleveland Clinic’s Center for Integrative Medicine. Consult your doctor before treating serious or chronic conditions.   More from Prevention: Natural Relaxation Tonics