Contains several components that can cause a negative reaction on skin in the presence of sunlight so any product that contains St. John’s wort should be followed by application of a broad-spectrum sunscreen rated SPF 15 or greater.
St. John’s wort’s association with improving depression when taken as an oral supplement is unrelated to its topical impact on skin. However, it does have potent antioxidant properties.
In terms of skin healing, research has shown that St. John’s wort enhances the process while minimizing pain, making it a suitable option for helping to minimize the formation and ultimate appearance of scars. St. John’s wort also has antifungal and antibacterial activity.
Journal of Ethnopharmacology, October 2010, pages 511-521
Journal of Alternative and Complementary Medicine, January 2010, pages 113-117
British Journal of Dermatology, February 2008, pages 360-369
Planta Medica, February 2002, pages 171–173
International Journal of Biochemistry and Cell Biology, March 2002, pages 221–241
Journal of Agricultural Food Chemistry, November 2001, pages 5165–5170