What Is Slippery Elm?

Slippery elm is a supplement derived from the inner bark of the slippery elm tree (Ulmus rubra), native to North America. Traditionally used in Native American medicine, it’s known for its mucilaginous texture when mixed with water—offering a soothing coating to irritated tissues. Though used for centuries to address ailments like sore throat, cough, and digestive discomfort, scientific research on its effects remains limited.

Supports Digestive Comfort

Slippery elm contains fibers and anti-inflammatory compounds like flavonoids and phenolics that may:

  • Stimulate mucus and saliva production

  • Coat the digestive tract lining

  • Soothe irritation and inflammation

IBS Symptom Relief

A small 8-week study involving people with irritable bowel syndrome (IBS) used capsules containing 150 mg of slippery elm along with probiotics, inulin, and other herbal ingredients. Results showed improvements in:

  • Abdominal discomfort

  • Bloating

  • Stool consistency

  • Fatigue

Another multi-ingredient study that included slippery elm, peppermint oil, quercetin, and guar gum also reported symptom relief for gas, heartburn, constipation, and diarrhea.

While encouraging, these results stem from formulas combining multiple substances, making it difficult to isolate the specific benefits of slippery elm.

May Help Soothe Sore Throat and Cough

Slippery elm is often used in teas, syrups, and lozenges for respiratory relief. Its mucilage may:

  • Coat and protect the throat

  • Stimulate saliva to ease dryness

  • Calm coughing fits and airway irritation

Despite historical use and anecdotal support, current clinical evidence for these effects is minimal.

How To Use Slippery Elm

You can find slippery elm in:

  • Capsules or tablets

  • Powder or tincture

  • Lozenges

  • Herbal teas (often combined with marshmallow root or licorice)

Always follow product-specific instructions, as dosages can vary.

Suggested Dosage

No standardized dose exists. Research-based products typically include slippery elm as part of a multi-ingredient blend. Stick to labeled guidance or consult a healthcare professional.

Safety Considerations

Slippery elm appears safe for most people, but precautions are advised:

  • Pregnancy and breastfeeding: Traditionally thought to affect the uterus and possibly cause miscarriage—avoid use.

  • Medication timing: Mucilage might impair absorption. Take slippery elm at least 1 hour after other meds.

  • Allergies: Topical use may trigger irritation in sensitive individuals.

Opt for third-party tested products to ensure quality and purity. Look for seals from NSF International, USP, or ConsumerLab.

Potential Side Effects

When taken orally:

  • Generally well tolerated

  • May cause mild digestive upset in rare cases

When applied topically:

  • Risk of rash or irritation in people with sensitive skin

As with all supplements, check with a healthcare provider if you have underlying conditions or take medications.

Summary

Slippery elm offers promising soothing effects on digestive discomfort and throat irritation, largely due to its mucilage content. While centuries of traditional use support its reputation, modern clinical research is still insufficient to confirm its standalone effectiveness.

Before starting slippery elm, consult a medical professional—especially if pregnant, breastfeeding, or taking medications.