Marshmallow (Althea officinalis)—the herb, not the white puffy confection roasted over a campfire—has been used for centuries as both a food and a medicine. Its botanical name comes from the Greek word "altho," which means "to cure." The Romans, Chinese, Egyptians, and Syrians used marshmallow as a source of food, while the Arabs made poultices from its leaves and applied this to the skin to reduce inflammation. The mucilage, or gummy secretion, in the leaves and particularly the root is helpful for soothing sore throats, chapped skin, and minor wounds.

Found in southern and western Europe, western Asia, and the northeastern region of North America, marshmallow originally grew in salty soils but now thrives in moist, uncultivated ground. Its fleshy, erect stems reach a height of three to four feet. The stems give off simple branches or, at most, a few sideways branches. The pale yellow roots are tapered, long, and thick, with a tough yet flexible exterior. The short-stemmed leaves are round, with irregularly toothed margins and three to five lobes. A soft and velvety down covers the leaves and stem. The flowers have five reddish-white petals. The whole plant, especially the root, is filled with mild mucilage.

The leaves and roots of marshmallow are the parts used for medicinal purposes.

Professional herbalists may recommend marshmallow for the following health problems based on its long history of use in traditional healing systems, as well as results of laboratory and animal studies.

• Asthma
• Bronchitis
• Common cold/sore throat
• Cough
• Inflammatory bowel diseases such as Crohn's disease and ulcerative colitis
• Stomach ulcers
• Weight loss aid (marshmallow swells with fluid and gives a sense of fullness)
• Wound healing

Dried leaves may be used in infusions, fluid extracts, and tinctures. Marshmallow roots are available dried, peeled, or unpeeled in extracts (dry and fluid), tinctures, capsules, ointments/creams, and cough syrups.

Pediatric

Adjust the recommended adult dose to account for the child's weight. Most herbal dosages for adults are calculated on the basis of a 150 lb (70 kg) adult. Therefore, if the child weighs 50 lb (20 to 25 kg), the appropriate dose of marshmallow for this child would be 1/3 of the adult dosage.

Adult

The following are the recommended adult doses for marshmallow:

• Leaf infusion: 1 to 2 tsp in 5 ounces boiled water, two to three times daily
• Leaf fluid extract: ¼ to ½ tsp (1:1 g/mL), two to three times daily
• Leaf tincture: 1 to 2 tsp (1:5 in 25% ethanol), two to three times daily
• Root infusion or cold-water maceration (2% to 5%): 5 ounces (1 to 2 tsp) taken to soothe cough and sore throat
• Dried root: 2 to 6 g or equivalent preparations daily (cold infusion three times per day)
• Marshmallow cough syrup (from root): 2 to 10 g per single dose (syrup contains sugar, so people with diabetes should use with caution)
• Root topical preparations: 5% to 10% drug in ointment or cream base

The use of herbs is a time-honored approach to strengthening the body and treating disease. Herbs, however, contain active substances that can trigger side effects and interact with other herbs, supplements, or medications. For these reasons, herbs should be taken with care, under the supervision of a practitioner knowledgeable in the field of botanical medicine.

There are no reported side effects of marshmallow, and it appears to be safe for use during pregnancy and breastfeeding.

Marshmallow may interfere with the absorption of certain medications. For this reason, it is important to take marshmallow several hours before or after ingesting other herbs or medications.

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