Betaine HCL natural source hydrochloric acid. Stomach acid can also cause indigestion. Believe it or not, too little stomach acid is the most common cause of an acid stomach, not excess acid. Some people take antacids to relieve the uncomfortable acid feeling in their stomachs. But the vast majority of those with an "acid stomach" suffer from not enough acid. They simply can't digest what they've eaten. For some, an antacid may temporarily relieve a queasy stomach, but in the long run, regular use of antacids make the problem worse. Derived from beets 90 vegetable caps