In cases like heart burn, gastric reflux or indigestion, it is usually automatically assumed that the patient must have too much acid in the stomach. Too much acid is correct. But the real question is, “Which acid and where is it coming from?” And how can you tell if it’s too high or too low?

Physiology Lesson

In modern-day Western Medicine, it is assumed that this excess acidic state of the stomach is due to the hydrochloric acid (HCl) that is secreted by the parietal cells in the stomach lining itself. When you start eating, the stomach should produce and secrete HCl to begin the process of digesting your food. It has 3 main jobs:

  1. It activates pepsinogen to be converted to pepsin which breaks down protein in food
  2. It acidifies the stomach contents which triggers emptying of the stomach contents into the small intestine
  3. It keeps the small intestine sterile so that bacteria and parasites do not overgrow

These are all very important functions, and if HCl is deficient, neutralized or suppressed, it will negatively affect the rest of the digestive functions, causing more problems down the road such as bloating, gut infections, parasitic infections, SIBO (Small Intestinal Bacterial Overgrowth), constipation, undigested food in the stool, and others.

But what happens when a person goes to the doctor complaining of heartburn, reflux, or indigestion? They get a prescription for something that either neutralizes the acid or blocks its production. Now, this can temporarily make the patient feel better, but as you can see, it may not always be the best choice.

What Else Can Cause Acid in the Stomach?

Stomach FireThis is a controversial topic, but I challenge anyone to truly look at the physiology, especially if nutritional deficiency, pathology or infection is involved. Hypochlorhydria (a state in which the stomach does not create enough HCl), can also, in a round-about way, cause the stomach environment too acidic. Allow me to explain. . .

If adequate HCl is not present in the stomach, the protein you have eaten will begin to putrefy and ferment because there is a delay in gastric emptying. This process creates organic acids coming off the rotting food, causing the stomach environment to become too acidic. This acid can mimic symptoms of increased gastric secretions.

A note about reflux: when the contents of the stomach become acidic enough, they dump into the small intestine for continued digestion. If this process isn’t happening on time due to low HCl, what can develop is a situation where instead of going down, the food or stomach juice comes up. For a more detailed look at this process, please see my article The Importance of Hydrochloric Acid for Proper Digestion.

Causes of Hypochlorhydria

The body is designed pretty brilliantly and most functions continue as usual until toxins or poor food and lifestyle choices interfere. That being said, let’s look at some causes of hypochlorhydria:

  • Long-term stress (initially stress can increase HCl but over time, HCl reserves become depleted due to increased demand)
  • B vitamin, zinc and other mineral deficiencies needed to make HCl
  • Excess sugar or processed carbohydrate diet which deplete above nutrients
  • H. pylori infection (bacteria that burrows into the stomach lining and degrades the parietal cells that are supposed to secrete HCl)
  • Poor blood sugar control, hypoglycemia or insulin resistance (blood sugar patients can’t retain zinc or B vitamins)
  • Food intolerances (disrupting digestion and promoting inflammation)
  • Age greater than 60

*Also to be noted here is that if adequate HCl is produced and secreted, but excess water is consumed during meals, the HCl can become diluted, leaving it less effective.

So How Can You Tell if You Produce Too Little HCl?

Without adequate HCl, protein will not be broken down properly. This results in seeing shifts on blood chemistry markers, especially Total Protein and Serum Globulin but also BUN and Phosphorus.

When protein isn’t appropriately broken down due to low HCl, Total Protein and Globulin will elevate on blood chemistry panels. At the same time, if HCl is lacking and protein is fermenting, protein may break down too quickly and we will see Total Protein and Globulin coming back under the optimal range. Therefore, if Total Protein and Globulin levels are outside the optimal range, hypochlorhydia should be considered.

When looking at blood chemistry from a functional nutrition standpoint, we like to see the following markers fall in these optimal ranges:

Total Protein

Serum Globulin g/dL


Phosphorus mg/dL

6.8 – 7.4 g/dL

2.4 – 2.8 g/dL

10 – 16 mg/dL

<3.0 mg/dL


The more indicators someone has, the more likely it is that they have hypochlorhydria, especially when accompanied by:

  • Loss of taste for meat or high protein foods
  • Burning in the stomach before or after eating
  • Undigested food in the stool
  • Acid or upset stomach with or without reflux
  • Bad breath
  • Gas or bloating
  • Indigestion or nausea after eating
  • Food (especially animal protein) sits in your stomach like a rock
  • Nutrient deficiencies
  • Diagnosed H. pylori, parasitic infection or chronic candida
  • Use of medications that block HCl production
Practical Acid Challenge

If you have an inflamed stomach lining, gastric or duodenal ulcers, elevated cortisol which thins the stomach lining, or gastric bleeding, you may feel worse when you take HCl. I made this mistake years ago when I was first in practice. I “assumed” the patient was low in HCl because she had all the classic symptoms. So, off she went with a brand new bottle of HCl. That night, she called me from the ER because she was doubled over in pain shortly after she took her first dose. It turned out that she had an ulcer, which we later determined was due to an H. pylori infection.

A commonly used practical way to see if extra HCl might help you is to take a tablespoon of apple cider vinegar between the 1st and 2nd bites of a meal. If your usual symptoms improve, you will likely to well with HCl. If your burning increases, it is likely that your gastric tissue is inflamed. You should avoid HCl, and do a month on a healing protocol instead. I like the ingredients in Glutagenics which are L-glutamine, deglycyrrhizinized licorice, and aloe leaf extract. They’re very healing and soothing, and designed to support the integrity and healthy function of the gastrointestinal lining. For fast relief and to increase defenses in the stomach lining, Zinlori is one that I like because it contains a patented zinc-carnosine complex.

How Can You Tell if You Produce Excess HCl?

Since the symptoms of high HCL and low HCl production are virtually identical, it can be difficult to differentiate. If you have high stress or elevated cortisol, your HCL may be in excess. If your cortisol is depleted due to prolonged stressors, chronic infections, food sensitivities or poor lifestyle, you are more likely to have lower HCl.

If you have a recent and new onset of H. pylori infection, this may initially cause excess HCl. But if the H. pylori went undetected or untreated for an extended period of time, it is more likely that your HCl is suppressed. H. pylori burrows under the stomach lining, degrading the parietal cells which are responsible to secreting your HCl. In this case, you may not be secreting adequate amounts.

What if I’m Still Not Sure?

If you’re willing to swallow an electronic device, the Heidelberg Stomach Acid Test can be administered. This is considered the Gold Standard for assessing stomach acid.

The Do’s and Dont’s of Supplementing with HCl

DO start off slowly. Take 1 with a protein meal (chicken breast, steak, etc). If no relief is achieved, wait a day and take 2 with your next protein meal. If this does nothing, you may increase at a similar rate (within reason) until relief is achieved. If you begin to notice burning in the stomach or even into the intestines, wait 2 days, then decrease your dose by 1.

DO use a good quality HCl product that also contains pepsin. One I like is Metagest, but there are other good products on the market.

DO expect an adjustment period. If you have been on PPI’s (proton pump inhibitors) or other medications that suppress HCL, you may have an initial increase in your reflux symptoms as your body begins to restore its function. This can last up to 2-3 weeks. Be patient. If need be, I tell patients to go for something to neutralize acid such as TUMS rather than go back to the PPI.

DON’T take HCL on an empty stomach. Ever!

DON’T chew HCl tablets

DON’T take if you have or have had ulcers or gastritis

DON’T take with anti-inflammatory medications such as Aleve, Advil, Motrin (or the generic equivalents such as ibuprofen) or aspirin, especially if you have been on these for an extended period of time.


This is a lot of information to take in. It can be confusing, as there are multiple factors to consider: too high vs too low, dosages, the adjustment period, other conditions that may mimic high or low HCl symptoms. That being said, it is advised to work with a professional who can help you sort it out as well as monitor your progress. After all, it’s not every day that we go around suggesting that you ingest acid!

Additional Articles that May be Helpful

The Importance of Hydrochloric Acid for Proper Digestion

Three Free Things You Can Do to Improve Digestion

SIBO Specific Supplements

These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. These suggestions are not intended to replace medical care. They are to be considered nutritional support and an adjunct to medical care.


This article was originally posted on my main site, where you’ll find a broad selection of health related topics and programs.


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