Marshmallow powder comes from the dried root of Althaea officinalis. The root contains a high amount of mucilage. Stir the powder into cool or warm water and it swells into a soothing gel. That gel coats and shields irritated mucous membranes. People turn to it to calm heartburn, indigestion, mild stomach ulcers, sore throats, and coughs.
Take the powder after meals when your goal is digestive comfort. For throat relief, try it between meals instead. Always mix with cold or warm water. Hot water can break down the mucilage. Leave at least a two hour gap between marshmallow and any medications or other supplements so it does not block their absorption.
Side effects are uncommon. Still, the herb may slow how fast the stomach empties. Anyone with an intestinal blockage or slow gut motility should steer clear. Pregnant or breastfeeding people lack safety data for this supplement and should avoid it. Speak with a doctor before you add something new.