Do Marshmallows Help With Acid Reflux?

No clinical trial or peer-reviewed study has found that eating marshmallows, the puffy candy, relieves acid reflux. The idea circulates widely online, but it rests on a mix-up between two very different things: the sugary confection sold in grocery stores and the medicinal plant called marshmallow root (Althaea officinalis), which has a centuries-long history as a soothing herbal remedy. Understanding why this confusion persists, what marshmallow root actually does, and why the candy version could make reflux worse turns out to be a surprisingly useful tour through how acid reflux works in the first place.

The Candy and the Plant Are Not the Same Thing

Modern marshmallows are made from sugar, corn syrup, gelatin, and air. They have no connection to the marshmallow plant beyond a shared name. Historically, confectioners did use the sticky sap of Althaea officinalis roots to make a soft treat, but manufacturers stopped using the plant extract well over a century ago, replacing it with gelatin for texture and industrial sweeteners for flavor. When someone reports that “marshmallows helped my heartburn,” they are almost certainly experiencing either a placebo effect, a brief soothing sensation from the soft texture, or they have read advice about marshmallow root and mistakenly applied it to the candy aisle.

Marshmallow root, by contrast, is a flowering perennial whose roots are rich in polysaccharides that form a thick, slippery gel called mucilage when mixed with water. Lab analysis has confirmed that the primary constituents of marshmallow root mucilage are polysaccharides, with the major sugar building blocks being rhamnose, galactose, and glucose.¹² None of those compounds are present in the bag of marshmallows next to the hot cocoa mix.

What Marshmallow Root Does and Does Not Do

The mucilage from marshmallow root works as what herbalists call a demulcent: a substance that coats irritated mucous membranes with a protective film. When you drink a marshmallow root tea or take a liquid extract, the gel-like polysaccharides temporarily blanket the lining of the throat and esophagus, which can ease the raw, burning sensation that follows a reflux episode. One pharmacy review noted that marshmallow root’s mucilage helps coat the esophagus and stomach lining, creating a barrier against stomach acid, and that it stimulates epithelial cell activity in ways that support tissue regeneration.³ Lab research on macrophages has also explored anti-inflammatory and antioxidant effects of Althaea officinalis root extract.⁴

That sounds promising, but an important caveat belongs here: most of this evidence comes from lab studies and traditional-use reports, not from large human trials comparing marshmallow root to a placebo for reflux symptoms. Nobody has published a randomized controlled trial showing that marshmallow root reliably reduces esophageal acid exposure or heals reflux-related erosions. The coating effect is real and may explain short-term symptom relief, but it does not address the mechanical and chemical causes of reflux itself. And the root also contains compounds, including flavonoid glycosides with sulfate groups and amino acid derivatives, that have not been tested for safety in high doses or during long-term use.⁵ The same pharmacy review that praised marshmallow root’s coating ability also flagged that its mucilage may interfere with the absorption of other medications.³

Why Sugar-Loaded Marshmallows Could Make Reflux Worse

If the candy version did anything to your reflux, the most likely effect would be negative. A regular marshmallow is roughly 60 percent sugar by weight. That matters because a randomized controlled trial looking at how dietary carbohydrates affect reflux found that reducing simple sugar intake by an average of about 62 grams per day led to a significant drop in esophageal acid exposure time and in the total number of reflux episodes. People in the low-sugar group also reported less frequent heartburn, less acid taste in the mouth, and better sleep.⁶ The broader dietary literature on reflux supports the same direction: reduced overall sugar intake, increased dietary fiber, and changes in eating habits all tend to improve symptoms.⁷

Adding a handful of marshmallows to your day pushes your simple-sugar intake in exactly the wrong direction. Four or five standard marshmallows contain around 25 grams of sugar, nearly half of the daily reduction that produced measurable improvement in the trial above. People who snack on marshmallows to soothe heartburn may be creating a cycle: the soft texture feels nice going down, but the sugar fuels the conditions that bring acid back up.

How Reflux Actually Damages Tissue

Understanding why a sugar-and-gelatin candy cannot address reflux requires a quick look at what reflux does to your body. Gastroesophageal reflux disease is driven primarily by acid, but the damage extends beyond the esophagus, where a digestive enzyme called pepsin plays a surprisingly aggressive role. Pepsin stays stable at near-neutral pH levels and can regain its tissue-destroying activity whenever acid reaches it again.⁸ When the esophageal lining is exposed to a mix of acid, bile salts, and pepsin, the tissue releases inflammatory signals that recruit immune cells and trigger chronic inflammation, oxidative stress, and eventually cell death.⁹

What makes this especially stubborn is that pepsin can stick to cells in the throat and esophagus and even get absorbed inside them. Once inside, it does damage from within the cell whenever the local pH drops again. Research on esophageal tissue has shown that pepsin in an acidic environment produces irreversible lesions within 15 minutes, while acid alone at the same duration creates damage that the tissue can fully reverse.¹⁰ A soft, sweet candy does not neutralize acid, deactivate pepsin, or reduce the number of times your lower esophageal sphincter opens inappropriately. It just melts and adds calories.

The Saliva Angle

One theory you occasionally see online is that chewing a marshmallow stimulates saliva, and saliva helps clear acid from the esophagus. There is real science behind the saliva part, just not the marshmallow part. After each reflux episode, your body relies on swallowing to send a wave of saliva down the esophagus. That saliva contains bicarbonate, a natural base that neutralizes leftover acid on the esophageal lining.¹¹

Research on chewing gum, which produces sustained jaw motion and salivary stimulation, found that doubling saliva flow roughly tripled the speed of acid clearance from the esophagus.¹² But a marshmallow dissolves in a few seconds. You do not chew it for twenty minutes the way you would chew gum. The brief act of eating one marshmallow generates far less total saliva than a stick of sugar-free gum and delivers a load of simple sugar in the process. If your goal is saliva-driven acid clearance, gum is a better choice, and the evidence actually supports it as a non-drug option for some people with symptomatic reflux.

Why People Believe It Works Anyway

The feeling of relief after eating a marshmallow is likely real, even if the marshmallow is not doing what people think. Reflux symptoms are highly responsive to expectation. A meta-analysis pooling results from clinical trials found that the overall placebo response rate in gastroesophageal reflux studies was about 19 percent, with some individual studies seeing placebo response rates as high as 47 percent.¹³ In other words, roughly one in five people in reflux trials report meaningful improvement even when they receive no active treatment at all. That is a substantial rate, and it means any remedy with a comforting ritual, a soft texture, or a trusted recommendation from a friend can “work” in the short term purely through psychology.

This does not mean the discomfort is imagined. The placebo effect operates through real neurological pathways that change how your brain processes pain signals. But it does mean that personal testimonials about marshmallows curing heartburn are essentially noise. Without controlled comparison, you cannot separate the effect of the marshmallow from the effect of believing the marshmallow will help, sitting upright to eat it, swallowing saliva in the process, or simply waiting a few minutes while reflux episodes naturally resolve on their own.

Practical Takeaways If You Are Dealing With Reflux

If you searched for this topic because you are looking for relief, a few evidence-backed approaches are worth knowing about:

• Cut simple sugars: Reducing your daily intake of simple sugars by a meaningful amount improves both measurable acid exposure and subjective symptoms like heartburn and that lump-in-the-throat feeling.⁶
• Chew sugar-free gum after meals: Sustained chewing roughly doubles saliva flow and markedly speeds acid clearance from the esophagus.¹²
• Try actual marshmallow root if you want the herbal route: Look for marshmallow root tea or a cold-water infusion of the dried root, which extracts the mucilage more effectively than hot water. Take it separately from other medications by at least an hour, since the mucilage can slow drug absorption.³
• See a doctor for persistent symptoms: Reflux that happens more than twice a week, or that comes with difficulty swallowing, unexplained weight loss, or chest pain, deserves proper evaluation. Pepsin-driven damage to esophageal tissue can become irreversible within minutes, and chronic reflux raises the risk of complications that no amount of marshmallow root will address.¹⁰

When Herbal Demulcents Make Sense and When They Do Not

Marshmallow root sits in a category of herbal remedies that coat and soothe irritated tissues. Other plants in this group include slippery elm and deglycyrrhizinated licorice. All of them share the same profile: plausible mechanism, centuries of traditional use, minimal safety concerns at normal doses, and almost no rigorous clinical trial data for reflux specifically. If you have occasional mild heartburn and want something gentler than an antacid, a demulcent tea is unlikely to cause harm and might genuinely help with symptom perception. The evidence is thin, but the risk is low.

Where demulcents fall short is in managing actual disease. Reflux that has progressed to the point of visible erosions, Barrett’s esophagus, or laryngopharyngeal reflux involving pepsin deposits in the throat is not going to be managed by a coating agent. Pepsin can stick to cells, enter them through the basolateral membrane, and cause intracellular damage that a surface-level mucilage film cannot reach.⁹ For that level of injury, acid suppression with medication, dietary changes, and sometimes surgical intervention are the tools that actually change outcomes. A demulcent might complement those treatments as a comfort measure, but treating it as a replacement is where people get into trouble.

The marshmallow candy myth is a perfect illustration of how folk remedies mutate as they travel through internet forums and social media. A real plant with real mucilage and a plausible coating mechanism gets conflated with a candy that shares only a name, and suddenly millions of search results confidently recommend a sugar bomb for a condition that sugar makes worse. If the topic interests you, look into the actual root. Just leave the s’mores out of it.