Overview

Black haw (Viburnum prunifolium) is a shrub native to the woodlands of southern North America. Its root bark has been traditionally used as medicine.

Black haw contains a chemical that might relax the uterus.

People use black haw for menstrual cramps, asthma, diarrhea, labor pain, and many other conditions, but there is no good scientific evidence to support these uses.

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