Apple cider vinegar - a product obtained as a result of fermentation of apples, using yeast and acetic bacteria. It is an unfiltered, unsweetened beverage made from apples that is slightly cloudy and extremely aromatic.Apple cider vinegar has been used for thousands of years. It contains many valuable nutrients, including acetic acid, the content of which is standardized in OstroVit preparation. Acetic acid is an organic chemical compound of the carboxylic acid group that dissolves well in water and, moreover, exhibits hygroscopic properties.