Could low stomach acid be the real problem?

If you experience bloating, reflux, excessive gas, or that uncomfortable “brick in the stomach” feeling after eating, you’ve probably been told at some point that you have too much stomach acid.

In practice, however, we often see the opposite.

Many of the patients who come to us with IBS-type symptoms, persistent bloating, or “unexplained” digestive issues are actually struggling with low stomach acid, not excess. This is a key distinction — because treating the wrong problem can make symptoms worse, not better.

One of the most commonly used tools in functional medicine to address this is betaine hydrochloride (Betaine HCl).

But while it can be extremely effective when used correctly, it is not something to take blindly. Understanding when and when not to use it is essential.

What is betaine hydrochloride?

Betaine HCl is a supplement designed to increase the acidity of the stomach.

It combines two components: betaine, a naturally occurring compound found in foods such as beetroot and spinach, and hydrochloric acid, the same acid your stomach produces to digest food.

Its role is not to digest food directly  unlike enzymes but to create the right environment for digestion to happen properly.

This distinction is important.

Without sufficient stomach acid, your body struggles to break down protein efficiently, activate key digestive enzymes, and absorb essential nutrients. Over time, this can have a surprisingly wide-reaching impact on gut health and overall wellbeing.

Why stomach acid matters more than most people realise

Stomach acid tends to have a bad reputation. Most people associate it with reflux, burning, or irritation something to suppress rather than support.

But in reality, adequate stomach acid is fundamental to good digestion.

It is responsible for initiating the breakdown of protein, allowing enzymes like pepsin to do their job effectively. Without this step, food sits in the stomach longer than it should, increasing the likelihood of fermentation, gas, and bloating.

It also plays a crucial role in nutrient absorption. Low stomach acid has been linked to deficiencies in vitamin B12, iron, zinc and magnesium nutrients that are essential for energy, immune function, and neurological health.

Perhaps most importantly, stomach acid acts as one of the body’s primary defence mechanisms. It helps neutralise harmful bacteria, parasites and pathogens before they can reach the intestines. When acid levels are low, this protective barrier weakens which may partly explain why we often see low stomach acid alongside conditions such as Small Intestinal Bacterial overgrowth and recurrent gut infections.

What causes low stomach acid?

Low stomach acid rarely occurs in isolation.

In many cases, it develops gradually over time and is linked to a combination of factors.

Age is one of the most common. As we get older, stomach acid production naturally declines. However, in clinic, we are increasingly seeing low acid in younger patients too often driven by modern lifestyle factors.

Can stress cause low stomach acid?

Chronic stress is a major contributor. The digestive system is highly sensitive to the nervous system, and when the body is in a constant “fight or flight” state, digestive function including acid production is downregulated.

Long-term use of acid-suppressing medication, such as proton pump inhibitors or omeprazole, can also play a role. While these medications can be helpful in the short term, prolonged use may further reduce stomach acid and, in some cases, perpetuate digestive issues.

Infections such as Helicobacter pylori are another key consideration, as they can directly interfere with the stomach’s ability to produce acid.

In clinical practice, we also frequently see low stomach acid in patients with IBS, SIBO, and Candida overgrowth. In these cases, it is often part of a wider picture of impaired digestion rather than a standalone issue.

Signs you may have low stomach acid

One of the challenges with low stomach acid is that its symptoms can easily be mistaken for high acid.

Patients often describe:

• persistent bloating, particularly after meals
• excessive gas or belching
• reflux or heartburn
• feeling full very quickly
• a sense that food “just sits there”
• worsening symptoms after eating protein such as meat

In some cases, there may also be signs of nutrient deficiency, such as fatigue, hair thinning, or low iron levels.

A particularly telling pattern is when symptoms do not improve or even worsen with antacids.

Betaine HCl benefits: who can it help?

When used appropriately, betaine HCl can be transformative.

By restoring stomach acidity, it helps improve the breakdown of protein and reduces the amount of undigested food available for fermentation in the gut. This alone can significantly reduce bloating and gas.

Interestingly, it may also help with reflux symptoms in certain individuals. This can seem counterintuitive, but when stomach acid is too low, digestion slows and pressure can build in the stomach, contributing to reflux. Supporting acid levels can sometimes improve this process.

There is also a broader impact on nutrient absorption. Many patients who struggle with low iron or B12 levels find that addressing stomach acid is an important piece of the puzzle.

From a functional medicine perspective, supporting stomach acid may also play a role in reducing susceptibility to conditions like SIBO, strengthening one of the body’s natural defence mechanisms.

Betaine HCl side effects and safety consideration

Although betaine HCl is widely used, it is not suitable for everyone.

The most common side effect is a burning or warming sensation in the stomach or chest. In some cases, this simply indicates that the dose is too high. In others, it may suggest that the stomach lining is already irritated.

More significant discomfort, pain, or nausea should always be taken as a signal to stop.

There are also certain situations where betaine HCl should be avoided altogether. This includes individuals with active ulcers, gastritis, or conditions such as Barrett’s oesophagus. Caution is also needed if you are taking medications such as NSAIDs or corticosteroids, which can increase the risk of irritation to the stomach lining.

Importantly, betaine HCl should never be taken on an empty stomach.

How do you know if you need betaine HCl

This is one of the most common questions we get asked  and it is where many online guides oversimplify things.

While there is a popular “titration test” involving gradually increasing the dose until a warming sensation is felt, this is only a rough guide and not a definitive diagnostic tool.

In practice, we take a broader view.

How can you test for low stomach acid?

In practice, assessing low stomach acid is not always straightforward.

In clini, we begin by looking at the overall clinical picture including symptoms, medical history, and patterns such as bloating after protein-rich meals, reflux that does not respond to antacids, or signs of nutrient deficiency.

Functional testing can be helpful, but it is important to be clear about what these tests can and cannot tell us.

For example, SIBO breath testing does not measure stomach acid levels directly. However, it can provide useful insight into downstream effects of impaired digestion.

Low stomach acid may reduce one of the body’s key defence mechanisms against ingested bacteria, allowing microbes to survive and proliferate in the small intestine.

In this way, SIBO can sometimes be a secondary consequence of low stomach acid, rather than a direct measure of it.

Similarly, comprehensive stool testing does not assess stomach acid itself, but may highlight patterns such as dysbiosis, opportunistic organisms, or maldigestion, all of which can be associated with suboptimal digestive function higher up in the gastrointestinal tract.

For a direct assessment of stomach acid, the gold-standard test is the Heidelberg test, which involves swallowing a small capsule that measures stomach pH in real time. However, this test is rarely available in the UK and is not commonly used in routine clinical practice.

As a result, assessment of stomach acid levels is often based on a combination of clinical judgement, symptom patterns, and response to carefully guided interventions, rather than a single definitive test.

How to take betaine HCl safely

If betaine HCl is appropriate, it should always be introduced gradually.

It is typically taken with meals particularly those containing protein and never on an empty stomach. Many formulations include pepsin, which works alongside stomach acid to support protein digestion.

Pepsin is a digestive enzyme produced in the stomach. It is responsible for breaking down proteins into smaller peptides that can then be further digested and absorbed in the small intestine.

However, pepsin is only activated in a sufficiently acidic environment. This means that without adequate stomach acid, pepsin cannot function effectively.

This is why betaine HCl and pepsin are often combined in supplements the acid creates the optimal environment, and pepsin carries out the actual breakdown of protein. Together, they help restore a more natural and efficient digestive process.

From a clinical perspective, this combination can be particularly helpful in individuals who experience symptoms after eating protein-rich meals, such as bloating, heaviness, or excessive fullness.

In terms of dosing, there is no one-size-fits-all approach. Requirements vary depending on the individual, their symptoms, and the underlying cause of impaired digestion. Some people may only need a small amount, while others require a higher dose initially.

Importantly, the goal is not lifelong supplementation.

As digestion improves and as underlying issues such as stress, nutrient deficiencies, or gut imbalances are addressed many individuals find they are able to gradually reduce or discontinue betaine HCl over time. The dose varies from person to person, and in some cases, the need for supplementation may reduce over time as digestion improves.

How to Choose a Good Betaine HCl Supplement

Not all betaine HCl supplements are created equal, and choosing the right product can make a significant difference in both effectiveness and tolerance.

In practice, we often see patients taking supplements that are either poorly formulated or not appropriate for their needs, which can lead to little benefit — or unnecessary side effects.

There are a few key things to look for.

First, it is generally preferable to choose a product that contains pepsin alongside betaine HCl. As discussed earlier, pepsin is the enzyme responsible for breaking down protein, and it requires an acidic environment to function. Combining the two helps more closely replicate the stomach’s natural digestive process.

The dose per capsule is also important. Most well-formulated supplements provide between 500–650 mg of betaine HCl per capsule, which allows for flexibility when adjusting the dose. Products that are significantly under-dosed may be ineffective, while very high-dose capsules can make it harder to titrate gradually.

Ingredient quality should not be overlooked. A cleaner formulation, without unnecessary fillers, artificial additives, or binders, is generally better tolerated particularly in individuals with sensitive digestion or complex gut issues.

Some supplements also include additional ingredients such as gentian or other bitter herbs, which can help stimulate digestive function more broadly. These may be useful in certain cases, particularly where there is sluggish digestion or low appetite, although they are not essential for everyone.

It is also worth choosing a reputable brand with good manufacturing standards, as quality control can vary widely between products.Pure Encapsulations is a great brand.

Ultimately, the “best” supplement is not simply the strongest or most expensive, but the one that is well tolerated, appropriately dosed, and used in the right clinical context.

Supporting stomach acid naturally

While supplements can be helpful, it is equally important to address the foundations of digestion.

Eating in a relaxed state, chewing food thoroughly, and allowing adequate time between meals can all support stomach acid production. Constant snacking, on the other hand, can interfere with digestive signalling.

Bitter foods and herbs such as rocket, dandelion, and artichoke can gently stimulate digestion, and some individuals find that small amounts of apple cider vinegar before meals are beneficial, if tolerated.

Ginger is another useful addition, particularly where sluggish digestion is part of the picture.

The bigger picture: IBS, SIBO and reflux

One of the reasons betaine HCl has gained attention is because it sits within a much bigger conversation about digestive health.

In many of the patients we see, symptoms such as bloating, reflux, and irregular bowel habits are not caused by a single issue, but by a combination of factors including impaired digestion, microbial imbalance, and altered gut motility.

Low stomach acid can be one piece of that puzzle.

Addressing it in isolation may help, but the most effective approach is always to understand and treat the underlying drivers.

Final thoughts

Betaine HCl can be a powerful and effective tool when used appropriately, particularly for those struggling with symptoms linked to low stomach acid.

However, it is not a one-size-fits-all solution, and it is not a substitute for understanding the root cause of digestive issues.

If you suspect low stomach acid, the most important step is not simply to reach for a supplement, but to ask why your digestion is not functioning optimally in the first place.

If you are experiencing ongoing bloating, reflux, or IBS symptoms, identifying the root cause is key.

At our clinic, we take a functional, personalised approach using advanced testing and targeted treatment plans to help restore proper digestion and gut health.

Frequently Asked Questions About Betaine HCl

What does betaine HCl do?

Betaine HCl is used to increase stomach acid levels, helping improve digestion, particularly of protein. It supports the activation of digestive enzymes such as pepsin and may help reduce symptoms like bloating, gas, and indigestion.

Can betaine HCl help with acid reflux?

In some cases, yes.

Although it may seem counterintuitive, low stomach acid can contribute to reflux symptoms. When acid levels are too low, food may sit in the stomach longer, increasing pressure and leading to reflux.

However, betaine HCl should only be used cautiously and ideally under professional guidance in individuals with reflux.

What are the side effects of betaine HCl?

The most common side effect is a burning or warming sensation in the stomach or chest.

Other possible side effects include:

• nausea
• discomfort
• irritation if taken incorrectly

If significant discomfort occurs, supplementation should be stopped.

How do I know if I have low stomach acid?

Common signs include:

• bloating after meals
• excessive gas or belching
• reflux
• feeling full quickly
• nutrient deficiencies

Testing may involve clinical assessment, functional testing (such as SIBO or stool testing), or, in rare cases, direct measurement of stomach acid.

Can you test stomach acid levels at home?

There is no highly accurate at-home test.

The betaine HCl titration method is sometimes used as a rough guide, but it is not definitive. More reliable assessment usually involves looking at symptoms, history, and underlying gut function.

Is betaine HCl safe long-term?

For some individuals, betaine HCl may be used short- to medium-term while digestion improves.

However, long-term use without addressing underlying causes (such as stress, infections, or SIBO) is not ideal.

If you suspect low stomach acid may be contributing to your symptoms, the most important step is identifying the underlying cause.

We offer comprehensive gut testing, including SIBO breath testing, alongside personalised treatment plans.

👉 Book your consultation today and take the first step towards better digestion.

References

• Waldum HL, et al. Gastric acid secretion and its clinical relevance. Scandinavian Journal of Gastroenterology.
• Martinsen TC, et al. The physiology of gastric acid secretion. Nature Reviews Gastroenterology & Hepatology.
• Howden CW, Hunt RH. Relationship between gastric secretion and infection. Gut.
• Lombardo L, et al. Increased incidence of small intestinal bacterial overgrowth during proton pump inhibitor therapy. Clinical Gastroenterology and Hepatology.
• O’Connell MB, et al. Effects of proton pump inhibitors on vitamin and mineral absorption.
• Allen LH. Causes of vitamin B12 and folate deficiency. Food and Nutrition Bulletin.

Author – Victoria Tyler BSc Hons MBANT

Victoria Tyler owns and runs two busy clinics : Nutrition and Vitality and the IBS and Gut Disorder Clinic.

Nutrition and Vitality, along with the IBS and Gut Disorder Clinic, were founded with the goal of helping patients alleviate IBS symptoms by uncovering and addressing the root causes of their digestive issues.

As a Registered Nutritional Therapist, Victoria holds a BSc (Hons) in Nutritional Therapy and has trained with the Institute of Functional Medicine. She is also accredited by BANT and CNHC.

Before transitioning into health, Victoria earned a degree in Economics and an MBA, working with corporations including Canon and Vodafone. However, her own health challenges led her to pursue a career in Nutritional Therapy.

With a passion for learning, Victoria is committed to staying at the forefront of Functional Medicine. She helps patients manage IBS and other digestive disorders, including SIBO, Candida, and IBD, by identifying and addressing their root causes.

Victoria strongly believes that every symptom has an underlying cause, and there is always a solution to every health condition. To learn more, or to see patient reviews, visit Victoria’s profile on Google.

DISCLAIMER: The information provided in this article is intended for general informational purposes only and should not be construed as medical advice, diagnosis, or treatment. The products and methods mentioned are not a substitute for professional medical advice from a trained healthcare specialist. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. Use of the information and products discussed is at your own risk.