Blessed thistle is a plant that grows in North America. It can be taken as a pill or powder. Its leaves can also be made into a tea.
There aren’t any advised doses for blessed thistle.
There is not enough data to support that blessed thistle is helpful in treating health problems. We will review future studies as they are published.
Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.
It is likely safe for most people to take blessed thistle for a short time. People with certain plant allergies may have an allergic reaction to blessed thistle. Not enough studies have been done to say whether it is safe to take for a long period.
Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse, such as:
1. Bruno M, Rosselli S, Maggio A, et al. Antibacterial evaluation of cnicin and some natural and semisynthetic analogues. Planta Med. 2003;69:277–81.
2. Barrero AF, Oltra JE, Alvarez M, et al. New sources and antifungal activity of sesquiterpene lactones. Fitoterapia. 2000;71:60–4.
Last reviewed May 2019 by EBSCO NAT Review Board Eric Hurwitz, DC