Comarum palustre, commonly known as marsh cinquefoil or purple marshlocks, is a plant that offers several potential health benefits. Traditionally used in herbal medicine, it is believed to have anti-inflammatory properties, which can aid in reducing inflammation and associated symptoms. Additionally, marsh cinquefoil is known for its astringent properties, which may help in managing gastrointestinal issues such as diarrhea or stomach discomfort. Some studies suggest that it may also possess antioxidant activity, contributing to cellular health and potentially reducing the risk of certain diseases. This guide covers the history, properties, preparation, dosage and usage of Comarum palustre as a medicinal herb.