None. Stomach acid is essential for nutrient absorption and killing off pathogens.
Many people think they have too much acid but in fact don’t have enough acid. Without enough stomach acid the Lower Esophageal Sphincter (LES) tone may weaken or relax inappropriately allowing stomach acid to flow back into the esophagus.
Causes of low stomach acid include stress, aging, gastritis, poor diet, nutrient deficiencies - iron, zinc, B vitamins, smoking, alcohol, H. Pylori infection, acid blockers, stomach surgery.
In my case it’s autoimmune gastritis. I take digestive enzymes supplements and if the meal contains a good amount of protein then I also take betaine HCL with pepsin supplements. I feel so much better on these supplements!!