Butterbur extracts have been shown effective in the treatment of migraines and allergies.
Butterbur is an herb native to Europe, Southwestern Asia, and North Africa. It has been used to treat allergies, asthma, headache, and muscle spasms. Butterbur was shown in clinical studies to be effective for migraines, allergic rhinitis (inflammation of the mucus membranes of nose marked by runny nose, congestion, itching, and sneezing) and asthma.
Butterbur contains compounds known as pyrrolizidine alkaloids that can causeliver toxicity.