Marshmallow root tea is best known for soothing irritated tissues, from a scratchy throat to an upset stomach. The root of the marshmallow plant (not the candy) contains a gel-like fiber called mucilage that coats and protects mucous membranes throughout your body. This simple mechanism is behind most of the tea’s traditional and researched uses.
How Marshmallow Root Works
When you steep marshmallow root in water, it releases polysaccharides that form a slippery, gel-like substance. This mucilage physically coats irritated tissue, creating a protective layer similar to your body’s own mucus. Lab research has shown that these polysaccharides are bioadhesive, meaning they stick to cell surfaces and form a barrier that shields damaged or inflamed tissue while it heals.
Beyond this coating effect, aqueous extracts from marshmallow root stimulate the activity of epithelial cells, the cells that line your throat, digestive tract, and other internal surfaces. This suggests the tea doesn’t just passively protect tissue but may actively support tissue regeneration. The root also contains flavonoids with antioxidant properties, which contribute to its anti-inflammatory effects.
Soothing Dry Cough and Sore Throat
This is probably the most common reason people reach for marshmallow root tea. The mucilage coats the back of the throat and upper airways, reducing the tickle and irritation that trigger a dry, unproductive cough. A review of animal and clinical studies confirmed that marshmallow extracts are effective for treating dry cough on their own. When combined with other herbs like ginger or ivy leaf, the effectiveness improved and extended to other types of cough as well.
If you’re dealing with a cold, post-nasal drip, or just a raw throat from dry air, the coating action provides a temporary but noticeable relief. The effect is mechanical rather than pharmaceutical: the mucilage creates a physical barrier over irritated tissue, which is why you’ll notice the benefit soon after drinking the tea and may want another cup as it wears off.
Digestive Tract Protection
The same coating mechanism that soothes your throat works all the way down. Marshmallow root’s mucilage and flavonoids can cover and protect the stomach lining, which is why the plant has a long history of use for heartburn, gastritis, and general digestive discomfort.
In a study on rats with drug-induced stomach ulcers, marshmallow extract provided significant protection against ulcer damage. The protective effect appeared to work through two pathways: reducing oxidative stress in the stomach lining and inhibiting the release of histamine, a chemical that increases stomach acid production. Histopathological examination confirmed that the tissue damage was notably less severe in animals pretreated with the extract compared to those that received none.
For people who experience occasional acid reflux or stomach irritation, drinking the tea between meals may help by adding a protective layer over the stomach and esophageal lining. This won’t replace treatment for chronic conditions like GERD, but it can offer a mild buffer against everyday digestive discomfort.
Skin and Inflammation
While most people drink marshmallow root tea for internal benefits, the plant also has documented anti-inflammatory effects that extend to skin health. Research has found that marshmallow root stimulates certain cells involved in anti-inflammatory activity. A 2013 review reported that an ointment containing 20% marshmallow root extract reduced skin irritation, performing only slightly below a synthetic anti-inflammatory drug. Interestingly, combining both ingredients in a single ointment outperformed either one alone.
For skin conditions like eczema or boils, topical application is the more direct route. But drinking the tea contributes antioxidants and may offer mild systemic anti-inflammatory support. Some people use cooled marshmallow root tea as a compress on irritated skin, taking advantage of the mucilage’s soothing properties externally.
Cold Infusion vs. Hot Tea
Here’s something most people don’t realize: cold water extracts a purer concentration of the beneficial mucilage than hot water does. When you simmer marshmallow root, you also pull out starches from the plant, which dilute the mucilage content. A cold infusion gives you a thicker, more gel-like result that maximizes the coating effect.
To make a cold infusion, fill a jar about one quarter full with dried marshmallow root, then fill the rest with lukewarm or room temperature water. Cover it and let it sit for at least four hours, or overnight for the strongest result. You’ll notice the water becomes noticeably thicker and slightly viscous. Strain out the root and drink it at room temperature or gently warmed.
If you prefer a quicker cup, you can pour boiling water over the dried root and steep for 5 to 10 minutes. You’ll still get beneficial compounds, just with a thinner consistency and a slightly different balance of polysaccharides and starches. Both methods work. The cold infusion is simply more concentrated in the mucilage that provides the soothing, coating effect.
How Much to Drink
There’s no standardized therapeutic dose established in clinical research. Most herbalists and product manufacturers suggest one to three cups daily, and the tea is generally considered safe for regular use. Follow the guidance on your specific product, since the concentration of dried root per serving varies between brands. If you’re making your own from loose dried root, a common starting point is about one tablespoon of dried root per cup of water.
One Important Interaction to Know
The same mucilage that makes marshmallow root therapeutic can also interfere with how your body absorbs other medications. The gel-like fiber can physically slow or reduce the absorption of pills taken at the same time. This applies to any oral medication. The simple fix is timing: drink your marshmallow root tea at least one hour after taking any medications. This gives your pills enough time to be absorbed before the mucilage enters your digestive tract.