Demulcent Teas: Marshmallow, Slippery Elm and Mallow for Throat and Gut Comfort: What Research Shows About the Tea, Safety and Cautions
Marshmallow root, slippery elm and mallow flower teas: EU regulator statements, one small sore throat tea trial, the medicine absorption caution, and throat signs that need care.
Content last updated . This page has not been medically reviewed.
Safety first. Natural products can cause side effects and interact with medicines. Read herbal tea and extract safety before you use anything on this page.
Safety first
- Other medicines: for marshmallow root, the EU monograph says absorption of medicines taken at the same time may be delayed. As a precaution it says the product should not be taken ½ to 1 hour before or after other medicines. [1] Tell a pharmacist about every medicine you take. See How Interactions Work.
- Throat symptoms that need help: the NHS lists difficulty breathing, being unable to swallow and drooling as reasons to seek emergency help. [2] In the US, call 911. A tea does not treat these.
- Children: the NHS says a child under 5 with a sore throat should see a GP (family doctor). [2] See Children and Teens.
What these teas are
Demulcent is the word the EU monographs use for a soothing preparation for irritation of the mouth and throat. This page covers three plants, as drinks. The plant profiles are in Marshmallow Root and Slippery Elm. A fuller page on one of the three is Marshmallow Root Tea.| Tea | Plant and part (GBIF accepted name) | Official statement | How the sources describe the tea | Notable cautions |
|---|---|---|---|---|
| Marshmallow root | Althaea officinalis L.; the root, which contains polysaccharide mucilage [3][4] | EU monograph: traditional use for irritation of the mouth or throat with dry cough, and for mild gastrointestinal discomfort [1] | A macerate: the herb soaked in water [1] | Delays absorption of other medicines; pregnancy and breastfeeding not recommended [1] |
| Mallow flower | Malva sylvestris L.; the flower [3][5] | EU monograph: the same two traditional uses [5] | An infusion (boiling water) or a decoction [5] | Children under 12 not established; pregnancy safety not established [5] |
| Slippery elm | Ulmus rubra Muhl.; the inner bark of a tree native to Eastern and Central US and Canada [3][6] | No EU monograph found at the EMA address we tried. This does not prove none exists. | Taken by mouth for sore throat and stomach upset, per LiverTox [6] | No liver injury linked to it in LiverTox [6] |
The marshmallow root monograph says the product is for these uses "exclusively based upon long-standing use". That is a regulatory category, not proof from trials. [1] The EU defines maceration as soaking the herb in water at room temperature for a defined period. [7] It also says infusion suits leaves, flowers and delicate parts, while decoction or maceration suits roots and bark. [7] How the sources describe preparation, and why, is on How Herbal Tea Is Prepared. Traditional use by named peoples and regions is not described in the sources we read.
What research shows about the tea
| Question | What the source found | Strength of evidence | Population and form studied |
|---|---|---|---|
| Sore throat pain from acute pharyngitis | A blended demulcent herbal tea reduced pain when swallowing more than a placebo tea, in the first 30 minutes after the first dose. The authors called the relief rapid and temporary. [8] | Promising but limited (one small trial; result cannot be assigned to one plant) | 60 adults randomized, 30 per group; 5 to 8 oz four to six times daily; study period 2 to 7 days. The abstract we read does not list the herbs in the blend. [8] |
| Marshmallow root tea alone, for throat or gut | Proper evidence not found. We searched PubMed for "marshmallow root cough sore throat", "Althaea officinalis randomized trial" and "marshmallow tea randomized". No trial of the tea alone appeared. | None | n/a |
| Slippery elm tea | Proper evidence not found. We searched PubMed for "slippery elm Ulmus rubra" and "slippery elm tea". The relevant result was a LiverTox safety entry, not a trial of the tea. | Traditional use only | n/a |
| Mallow flower tea | Proper evidence not found for trials of the tea. The EU monograph rests on long-standing use. [5] | Traditional use only | n/a |
For marshmallow root, LactMed notes that no scientifically valid clinical trials support its use to increase milk supply. [4] That is a separate use from throat comfort.
Sore throat: what the NHS says
- Sore throats are usually caused by viruses (like a cold or flu) or by smoking. [2]
- They normally get better by themselves within a week. [2] The NHS advises seeing a GP if a sore throat does not improve after a week. [2]
- Both the marshmallow root and mallow flower monographs say to consult a doctor if breathlessness, fever or pus-containing sputum occurs, or if throat symptoms persist beyond 1 week. [1][5]
For other throat and cough options, see Herbal Tea for Sore Throat, Cough and Colds, Cough and Sore Throat Remedies and Lemon-Ginger-Honey Tea for Colds.
Safety
- Medicines: besides the marshmallow root timing caution above, the marshmallow root and mallow flower monographs report no interactions. [1][5] Whether slippery elm or mallow tea delays absorption is not described in the sources we read. "None reported" is not proof of safety.
- Pregnancy and breastfeeding: the EU monograph does not recommend marshmallow root in pregnancy or breastfeeding because of insufficient data. [1] LactMed says no data exist on breast milk excretion, but that it is unlikely to harm a breastfed infant. [4] These two statements differ in tone; ask a clinician. See Pregnancy and Breastfeeding.
- Children: the marshmallow root monograph does not recommend use under 3 years for throat symptoms, and says use under 12 has not been established for stomach comfort. [1] The mallow flower monograph says use under 12 has not been established. [5]
- Allergy: LactMed says marshmallow is generally well tolerated in adults, with allergic reactions reported rarely. [4]
- Liver: LiverTox found no evidence that slippery elm raises liver enzymes or causes clinically apparent liver injury. [6] See Liver Safety.
- Blends: throat-comfort blends may contain other herbs. Check the label, and see Licorice in Tea Blends and Quality Testing and Certifications.
What research found and what to check: Slippery Elm Tea
Findings about drinking the tea itself, kept apart from capsules, extracts and concentrated supplements. Each card says what was studied, in whom, and how strong the evidence is.
Slippery elm tea and sore throat or cough (traditional use)
Not enough evidenceSlippery elm inner bark is used traditionally for sore throat, cough and stomach upset. Its mucilage is thought to coat and soothe the throat, but MSK says human data are lacking.
Supplements: Proper evidence not found for trials of the tea itself.
Soothing herbal tea blend for sore throat pain (blend, slippery elm not isolated)
Preliminary or mixedIn a placebo-controlled trial of 60 adults with acute pharyngitis, a branded demulcent herbal tea blend (5 to 8 oz, four to six times daily) lowered throat pain on swallowing more than placebo tea in the first 30 minutes. The relief was rapid and temporary.
Supplements: Promising but limited; blend only.
Constipation-type irritable bowel and gut symptoms (multi-ingredient formulas, not tea)
Not enough evidenceMSK describes a small pilot in which a formula containing slippery elm improved bowel habits in constipation-predominant IBS. A 43-person pre-post study of a seven-ingredient gut formula that includes slippery elm reported fewer symptoms.
Supplements: Extract only; multi-ingredient formulas.
Lab findings: antioxidant effects
Lab or animal research onlyMSK says antioxidant effects of slippery elm were shown in laboratory studies, not in patients.
Supplements: Lab or animal only.
Cancer claims: no evidence
Not enough evidenceMSK states there is no evidence slippery elm can treat infections, cancer or other serious medical conditions; it is one ingredient in the Essiac formula.
Supplements: No good evidence of benefit.
Documented risks and interactions (4)
- Liver: LiverTox found no link to liver injury. LiverTox says slippery elm preparations are generally recognized as safe and that there is no evidence they raise liver enzymes or cause clinically apparent liver injury.
- Other medicines: spacing is documented for marshmallow, not slippery elm. The EU monograph for marshmallow root says absorption of other medicines may be delayed and advises spacing by half an hour to an hour. Whether slippery elm does the same is not described in the sources we read.
- Pregnancy, breastfeeding and allergy: not described for slippery elm. MSK does not cover pregnancy or adverse reactions. For marshmallow, the EU does not recommend use in pregnancy or breastfeeding, and LactMed notes rare allergic reactions.
- Throat symptoms that need medical help. The NHS says to seek emergency help for trouble breathing, being unable to swallow or drooling, and to see a GP if a sore throat has not improved after a week or a child under 5 has one. A tea does not treat these.
Frequently asked questions
Is marshmallow root tea made with hot or cold water?
The EU monograph describes a macerate, which the EU defines as soaking the herb in water at room temperature. [1][7] Mallow flower is described as an infusion (boiling water) or a decoction. [5]
Does slippery elm tea soothe a sore throat?
Slippery elm inner bark is used traditionally for sore throat. [6] Proper evidence not found for trials of slippery elm tea. The one sore-throat tea trial we found tested a blend, and its herbs were not listed in the abstract. [8]
Can I drink these teas with my medicines?
For marshmallow root, the EU monograph advises leaving ½ to 1 hour before or after other medicines. [1] Ask a pharmacist, especially for slippery elm and mallow, where the sources we read are silent.
When should a sore throat be checked by a clinician?
The NHS says to see a GP if it does not improve after a week, and to seek emergency help for difficulty breathing, inability to swallow or drooling. [2] In the US, call 911 for an emergency.
Are these teas safe in pregnancy or for children?
The EU monographs do not recommend marshmallow root or mallow flower in pregnancy, and set age limits for children. [1][5] Ask a clinician first. See Children and Teens.
References
- European Medicines Agency, HMPC. European Union herbal monograph on Althaea officinalis L., radix, EMA/HMPC/436679/2015, Final, 12 July 2016. Read 2026-10-23.
- NHS (UK). Sore throat. Page last reviewed 8 April 2024. Read 2026-10-23.
- GBIF Secretariat. GBIF Backbone Taxonomy, species match service (same service queried for each plant named on these pages: Mentha spicata, Foeniculum vulgare, Carum carvi, Pimpinella anisum, Althaea officinalis, Ulmus rubra, Malva sylvestris, Zingiber officinale, Citrus limon, Matricaria chamomilla). Read 2026-10-23.
- National Library of Medicine. Marshmallow. Drugs and Lactation Database (LactMed), 2006 (record read through PubMed). Read 2026-10-23.
- European Medicines Agency, HMPC. European Union herbal monograph on Malva sylvestris L., flos, EMA/HMPC/749511/2016, last revised 20 November 2018. Read 2026-10-23.
- National Institute of Diabetes and Digestive and Kidney Diseases. Slippery Elm. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury, 2012 (record read through PubMed). Read 2026-10-23.
- European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Patient Leaflet template concerning advice on the preparation of herbal teas as (traditional) herbal medicinal products by end-users, EMA/HMPC/30603/2012, adopted 20 September 2016. Read 2026-10-23.
- Safety and efficacy of a traditional herbal medicine (Throat Coat) in symptomatic temporary relief of pain in patients with acute pharyngitis. Journal of Alternative and Complementary Medicine, 2003 (randomized, placebo-controlled trial of a branded blend; brand not endorsed here). Read 2026-10-23.