37 citations
,
April 2002 in “The American Journal of Medicine” St. John's Wort can cause dangerous high blood pressure if taken with certain foods.
33 citations
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March 2009 in “European Journal of Pharmaceutical Sciences” St. John's wort increases finasteride metabolism, reducing its effectiveness; use caution when combining them.
23 citations
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January 2001 in “International journal of toxicology” St. John's Wort extract and oil safety in cosmetics is unclear; more data needed on photosensitization, toxicity, and human irritation.
January 2011 in “Reactions Weekly” St. John's Wort may reduce the effectiveness of finasteride by increasing its breakdown in the body.
July 2017 in “Clin-Alert” Different medications can cause serious side effects in some people.