High in Acetic Acid, With Potent Biological Effects. Looking for a natural way to preserve your food, then apple cider vinegar could be highly useful. Numerous studies show that vinegar can improve insulin function and lower blood sugar levels after meals. Apple cider vinegar is claimed to help remedy skin conditions and reduce the signs of aging. Using vinegar when boiling eggs can also speed up the coagulation, or clotting, of the egg whites. This can be useful if the shell cracks while the egg is being boiled. Apple cider vinegar hair rinse is said to remove product buildup, detangle and add shine to your hair. Apple cider vinegar is a popular flavor and texture enhancer in baking, especially when making vegan treats that can't include eggs.