Apple cider vinegar contains probiotics which can help with digestion and gut health.

I found this link https://www.mdanderson.org/cancerwise/what-are-the-health-benefits-of-apple-cider-vinegar.h00-159696756.html that talks about the benefits of drinking apple cider vinegar. A few ingredients that stood out to me are:

• Acetic Acid- can help kill harmful bacteria
• Probiotics- boost the healthy bacteria in our microbiome
• Polyphenols- are an antioxidant that can reduce cellular damage by free radicals

Apple cider vinegar is acidic, so i would suggest diluting it before drinking it. This can be with water or another liquid as well. This may also help with indigestion and or acid reflux.

There is also more info here https://www.healthline.com/nutrition/6-proven-health-benefits-of-apple-cider-vinegar#summary