Licorice, marshmallow root, and slippery elm are three herbs commonly used in equine herbal medicine, particularly for their soothing effects on the digestive and respiratory systems. Here’s a detailed breakdown of each and how they’re used for horses:

1. Licorice Root (Glycyrrhiza glabra)

Primary Uses:

• Anti-inflammatory (especially for gastrointestinal and respiratory issues)

• Soothes ulcers and gastric irritation

• Supports adrenal function

• Mild expectorant

How It Works:
Licorice contains glycyrrhizin, which mimics corticosteroids and reduces inflammation. It also helps coat and protect mucous membranes, particularly in the stomach and lungs.

Common Uses in Horses:

• Gastric ulcers

• Respiratory allergies or infections

• Supporting horses under stress

Cautions:

• Long-term or high-dose use can lead to sodium retention, potassium loss, and increased blood pressure due to the glycyrrhizin.

• Deglycyrrhizinated licorice (DGL) is often recommended for safer long-term use (especially for gastric support).

2. Marshmallow Root (Althaea officinalis)

Primary Uses:

• Soothes mucous membranes

• Helps with digestive tract inflammation

• Moistens dry tissues

• Demulcent (forms a soothing film)

How It Works:
Marshmallow root is rich in mucilage, a slippery substance that coats and protects irritated tissues in the gut and respiratory tract.

Common Uses in Horses:

• Gastric ulcers or colic support

• Coughs or dry respiratory conditions

• Mouth or throat irritation

Cautions:

• Generally safe, but can interfere with absorption of oral medications if given at the same time.

3. Slippery Elm (Ulmus rubra)

Primary Uses:

• Mucosal protection for the stomach and intestines

• Soothes inflamed tissues in the throat and GI tract

• Acts as a mild laxative

How It Works:
Similar to marshmallow, slippery elm bark contains mucilage that coats irritated mucous membranes. It’s very gentle and often used during acute digestive upset.

Common Uses in Horses:

• Diarrhea or colic

• Gastric ulcers

• Respiratory irritation or dry cough

Cautions:

• Overharvesting in the wild is an ecological concern. Look for sustainably harvested sources.

• Like marshmallow, may impair medication absorption.

Combining the Three

These herbs are often used together in blends to support:

• Gastric health: Especially for ulcers, colic, or horses on long-term NSAIDs.

• Respiratory conditions: To reduce inflammation and irritation in the airways.

• General mucosal support: Especially in stressed, ulcer-prone, or allergic horses.

Dosage Guidelines (General, Not a Substitute for Vet Advice)

Exact amounts vary by product and horse size, but rough guidelines:

• Licorice root powder: 5–10 g/day

• Marshmallow root powder: 5–15 g/day

• Slippery elm powder: 5–10 g/day

Always introduce herbs slowly, monitor for any reactions, and consult with a veterinarian experienced in herbal therapies—especially if your horse is on medications.

This information is not meant to replace veterinary care.  Only use herbs upon advice of your horse’s practitioner.