The leaves are very high in thiamin (B1), choline, inositol, and fumaric acid. They are a good source of ascorbic acid (C), riboflavin (B2), calcium, potassium, and phosphorus. They also provide beta carotene (A), vitamin K, niacin, iron, and rutin.

For medicinal use, the whole plant in flower is used (except the roots) usually in the form of a tea or infusion. Either fresh or dried material may be used, but fresh is preferred as the dry material soon loses its medicinal properties. Infusion is excellent for stopping internal and external hemorrhages. Recommended for excessive menstruation. Shepherd's purse is astringent, anti-inflammatory, hemostatic, and diuretic. It constricts the blood vessels (usually), lowers blood pressure (usually), and contracts the uterus. It is used during or after childbirth and to ease difficult menstruation. This plant should not be used by pregnant people.

It also contains compounds (such as fumaric acid), which are known to have anti-cancer effects. The tea is sometimes recommended as a general tonic.

Externally, shepherd's purse has historically been used as an astringent and styptic to treat wounds. Caution is advised as human skin may blister from contact with the seeds.

The seeds, aside from sticking to insects, are also reported to be toxic to mosquito larvae, and, when put in the water, may possibly help control mosquitos. Shepherd's purse will also absorb excessive salts from the soil, and may be planted for that purpose.

Read More About It

• From the Shepherd's Purse: The Identification, Preparation, and Use of Medicinal Plants by Max G. Barlow.

• Shepherd's Purse: Organic Pest Control Handbook by Pest Publications.

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