GUT HEALTH
Low Stomach Acid: The Simple Home Test
Acid reflux, bloating, and indigestion are usually blamed on too much acid. But often it's the opposite. Here's how to test and fix it.
Stomach acid (hydrochloric acid / HCl) is essential for digestion. It breaks down protein, triggers enzyme release, kills pathogens, and enables mineral absorption.
Low stomach acid (hypochlorhydria) causes many of the same symptoms as high acid — but the treatment is opposite. Taking antacids for low acid makes things worse.
What Stomach Acid Does
Breaks down protein
Acid denatures proteins and activates pepsin, the enzyme that digests protein. Without adequate acid, protein sits and ferments.
Triggers downstream digestion
Acid in the small intestine triggers bile and pancreatic enzyme release. Low acid = incomplete digestion throughout.
Kills pathogens
Stomach acid is your first line of defense against bacteria, parasites, and fungi in food. Low acid lets them survive into the small intestine.
Enables mineral absorption
Iron, calcium, magnesium, zinc — all require adequate acid for absorption. Low acid = deficiencies despite good diet.
Symptoms of Low Stomach Acid
These overlap heavily with "high acid" symptoms — which is why low acid is often misdiagnosed:
Digestive
- • Bloating after meals
- • Feeling full quickly
- • Gas and belching
- • Acid reflux / heartburn
- • Nausea after supplements
- • Undigested food in stool
Systemic
- • Iron or B12 deficiency
- • Weak, brittle nails
- • Hair loss
- • Acne / skin issues
- • Chronic fatigue
- • Frequent infections
The paradox: Low acid causes the LES (lower esophageal sphincter) to stay open, allowing what little acid there is to splash up. Result: acid reflux from low acid.
What Causes Low Stomach Acid
Aging
Stomach acid production naturally declines with age. Most people over 50 have reduced acid output.
Chronic stress
The "rest and digest" nervous system produces acid. Chronic fight-or-flight suppresses it.
PPIs and antacids
Long-term use of acid-suppressing medications causes the stomach to produce even less acid.
H. pylori infection
This common bacteria damages acid-producing cells. Present in 50%+ of the world's population.
Zinc deficiency
Zinc is required to produce stomach acid. Low zinc = low acid = poor zinc absorption. A vicious cycle.
Home Testing Methods
The Baking Soda Test
A simple, free test you can do at home. Not perfectly accurate, but gives a general indication.
Instructions:
- 1. First thing in the morning (before eating/drinking anything)
- 2. Mix 1/4 teaspoon baking soda in 4oz cold water
- 3. Drink it
- 4. Time how long until you burp
Burp within 2-3 minutes: Normal acid levels
Burp at 3-5 minutes: Possibly low acid
No burp or >5 minutes: Likely low stomach acid
Do this test 3 days in a row for more accuracy. Results can vary.
Betaine HCl Challenge Test
More accurate than baking soda. Uses supplemental stomach acid to gauge your baseline.
Instructions:
- 1. Eat a meal containing protein (at least 4-6oz)
- 2. In the middle of the meal, take 1 capsule of Betaine HCl (500-650mg)
- 3. Finish eating and note how you feel over the next hour
Warmth, burning, or discomfort: You have adequate acid — don't take HCl supplements
No difference or feel better: Likely low stomach acid — you may benefit from HCl
How to Fix Low Stomach Acid
1. Betaine HCl Supplementation
The most direct approach. Take supplemental stomach acid with protein-containing meals.
Protocol:
- 1. Start with 1 capsule (500-650mg) with a protein meal
- 2. If no warmth/burning, add 1 more capsule next meal
- 3. Continue increasing by 1 per meal until you feel warmth
- 4. Back down by 1 capsule — that's your dose
- 5. As stomach acid improves, you'll need less over time
Some people need 1 capsule, others need 5+. It varies widely.
2. Apple Cider Vinegar
A gentler approach. Acidifies the stomach and stimulates natural acid production.
Protocol: 1-2 tablespoons in water 15-20 minutes before meals
3. Digestive Bitters
Bitter herbs stimulate digestive secretions naturally — stomach acid, bile, and enzymes.
Protocol: Take bitters 15-20 minutes before meals. Options: gentian, dandelion, artichoke, Swedish bitters.
4. Zinc Supplementation
Zinc is required to produce stomach acid. Replenishing zinc can help restore production.
Protocol: Zinc carnosine 75-150mg daily. Also supports gut lining. Take with food.
5. Lifestyle Factors
- • Chew thoroughly: Chewing signals the stomach to produce acid
- • Don't drink water with meals: Dilutes stomach acid
- • Eat in a relaxed state: Parasympathetic activation = acid production
- • Don't overeat: Smaller meals are easier to digest
Coming Off PPIs (Proton Pump Inhibitors)
If you've been on PPIs long-term, don't stop abruptly. Rebound acid hypersecretion can occur.
Gradual weaning protocol:
- 1. Cut dose in half for 1-2 weeks
- 2. Take every other day for 1-2 weeks
- 3. Take every third day for 1 week
- 4. Stop, using H2 blockers (like Pepcid) for breakthrough symptoms
- 5. Support with DGL, aloe, and dietary changes during weaning
Work with your doctor if you've been on PPIs for a long time or have an ulcer history.
Who Should NOT Take Betaine HCl
- • Active stomach ulcer or duodenal ulcer
- • Gastritis (acute stomach inflammation)
- • Currently taking NSAIDs or corticosteroids
- • On PPIs (must wean off first — HCl + PPIs can cause damage)
- • H. pylori infection (address this first)
If you have burning or discomfort from even small amounts of HCl, stop immediately. You may have an ulcer or gastritis that needs attention first.