النَّبِيِّ صلى الله عليه وسلم قَالَ ” نِعْمَ الإِدَامُ الْخَلُّ
The Prophet (ﷺ) said: “What an excellent condiment vinegar is.”
A good article from Web MD on the benefits of apple cider vinegar. I have been taking it myself for some time to benefit blood sugar regulation.