Persistent digestion problems, unexplained hair loss, and mineral deficiencies that won't correct themselves usually get blamed on diet. But the actual root cause is often something almost nobody thinks to check: whether your stomach is making enough acid in the first place.
Dr. Mikell Suzanne Parsons, DC, CCN, DACBN, DACNB, founder of The Natural Path Health Center in Fresno, calls this one of the most foundational and overlooked issues she sees in patients. Rather than guessing, she walks patients through a specific self-test called the betaine HCl challenge — a way to find out directly whether your body needs hydrochloric acid support, instead of treating symptoms without knowing the cause.
This is a real physiological test, not a general wellness trend, and it's worth understanding both how it works and why it matters before trying it.
Why Stomach Acid Is More Important Than It Sounds
Stomach acid isn't just there to help you feel full or move food along — it's what breaks down protein into usable building blocks. Without adequate hydrochloric acid, your stomach can't properly activate pepsin, the enzyme responsible for digesting protein, which means the amino acids your body needs for hormones, neurotransmitters, and tissue repair never get released the way they should.
Low stomach acid also disrupts something most people never connect to digestion: mineral absorption. When acid levels are inadequate, minerals aren't broken down into a form your intestines can absorb, which can leave you feeling dehydrated even if you're drinking plenty of water — because the problem isn't intake, it's whether those minerals are getting into your cells at all.
Undigested protein doesn't just disappear, either. It creates an environment where yeast, bacteria, and parasites in the stomach survive digestion instead of being neutralized, allowing them to move into the intestines and disrupt gut balance further downstream.
How the Betaine HCl Challenge Works
The betaine HCl challenge is a titration protocol: you gradually increase your dose of betaine hydrochloride (a supplemental form of stomach acid) until your body tells you it has enough. According to Dr. Parsons' protocol, you begin with one capsule of betaine HCl halfway through a protein-containing meal like breakfast. If you feel any heartburn, you stop — that's your answer, and you don't need hydrochloric acid support.
If nothing happens, you take two capsules with your next meal, following the same pattern: one at the start, one halfway through. If you still notice nothing, dinner moves to three capsules, split between the beginning, middle, and end of the meal. The dose continues climbing by one capsule at each new meal until you finally notice a warming or burning sensation — at which point you back off by one capsule and stay at that dose.
This titration approach reflects the actual clinical protocol used in integrative and functional medicine, where betaine HCl is introduced gradually with meals until a physiological response signals that stomach acid levels have been sufficiently restored. The dose that finally produces a response is essentially your body confirming how much acid it's currently missing.
What Your Results Actually Mean
Feeling heartburn during this test is good news, even though it doesn't feel that way. It means you've found the dose your body needs, and continuing to increase from there isn't necessary or advisable. From that point forward, the goal shifts to staying at the dose just below where the burning occurred.
If you make it all the way to six capsules split throughout a meal and still feel nothing, that's significant. It means that at every meal you've eaten up to that point, your protein wasn't being fully digested, your minerals weren't being properly absorbed, and your gut has likely been dealing with undigested food particles feeding an imbalance you didn't know was there. Research on betaine HCl supplementation has shown that a single dose can meaningfully lower gastric pH in people with reduced stomach acid production, which is the physiological basis for why this titration method works as a diagnostic tool.
If you're also taking supplements and not seeing results, an underlying absorption issue may be part of the picture. Learn more in our Why Supplements Don't Work post.
Signs Low Stomach Acid Might Be Affecting You
This test is especially worth trying if you're already dealing with digestive symptoms, unexplained hair loss, or a sense that your body isn't absorbing nutrients no matter what you eat. Chronic digestive discomfort after meals, in particular, is one of the clearest signals that acid production may be part of the picture.
Hair loss is a less obvious sign, but it connects back to the same root issue — if protein isn't being broken down efficiently, your body doesn't have the amino acids it needs for tissue growth and repair, hair included. Dr. Parsons notes that if you're eating consistently but still experiencing these symptoms, low stomach acid deserves a look before other explanations.
Doing the Challenge Safely
This protocol should be approached deliberately, not competitively. Dr. Parsons is direct about this: one patient in her own life pushed the test up to seventeen capsules in a single meal chasing a heartburn response that never came, which is well beyond what the test is designed for and not a safe way to run it.
The goal isn't to see how high you can go — it's to stop at the first sign of a response and use that as your answer. If you're unsure whether your symptoms warrant this test, or you want guidance interpreting your results, working with a clinician who can walk you through the process safely is the better starting point than experimenting alone.
Finding Out What Your Body Actually Needs
Low stomach acid is one of the most common and most missed root causes behind digestive complaints, mineral deficiencies, and even hair loss — and the betaine HCl challenge offers a direct way to find out if it's affecting you, rather than guessing based on symptoms alone. Understanding your result is only the first step; knowing what to do with it, and how it fits into your broader nutritional picture, is where personalized guidance makes the difference.
If you've tried this test, or you suspect stomach acid is behind symptoms you haven't been able to resolve, a Fresno nutritionist can help you interpret what's happening and build a plan around it. Reach out to The Natural Path Health Center to talk through your results.
Frequently Asked Questions
What is the betaine HCl challenge?
It's a self-test that involves gradually increasing your dose of betaine hydrochloride with meals until you feel a warming or burning sensation, which indicates your body has reached an adequate acid level and reveals whether you were low to begin with.
What does it mean if I never feel a reaction during the test?
Reaching a high dose without any response typically means your stomach acid production is significantly low, and your body has likely been under-digesting protein and under-absorbing minerals for some time.
Is it safe to keep increasing the dose indefinitely?
No. The test should stop at the first sign of heartburn or burning, and pushing well beyond that point without a response is not a safe way to run the protocol. Work with a clinician if you're unsure how to proceed.
Can low stomach acid really cause hair loss?
Yes, indirectly. Without enough stomach acid, protein isn't fully broken down into the amino acids your body needs for tissue growth and repair, which can show up as hair thinning or loss over time.
Do I need a professional to do this test?
You can start the test on your own following the protocol, but working with a clinician is recommended for interpreting your results and determining next steps, especially if you have underlying digestive or health conditions.
Dr. Mikell Suzanne Parsons, DC, CCN, DACBN, DACNB
Dr. Mikell Suzanne Parsons, DC, CCN, DACBN, DACNB is a Doctor of Chiropractic, certified clinical nutritionist, and brain wellness expert with 34+ years serving Fresno families at The Natural Path Health Center.
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