This is a hard one to swallow – haha – apple cider vinegar for acid reflux or heartburn. Everyone, I tell about this, says that ACV (apple cider vinegar) is acidic and I already have enough acid! Contrary to popular opinion, heartburn is a result of not enough acid! From Wikipedia:
The valve that empties the stomach into the intestines is triggered by acidity. If there is not enough acid, this valve does not open, and the stomach contents are churned up into the esophagus. However, there is still enough acidity to irritate the esophagus.
If you want to get rid of heartburn or indigestion, take 2 tablespoons of ACV. Eating apples, as I have said before in one of my posts on acid reflux, is also a good remedy.

DIY Medicine Cabinet: Grandma’s Remedies | Healthy and Green Living

Indigestion and Heartburn
It almost goes without saying–but consider why yoe’re getting heartburn in the first place. Did you overeat? Too much grease or spicy food? Eating late at night? Scout out the cause and try to stop this before it happens. Then, put down the antacids. The belching, bloat, and heartburn caused by indigestion come about because you don’t have enough stomach acid to do the job right. A spoonful or two of apple cider vinegar will help break down the excess food that is causing you trouble and bring your stomach back to balance.

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