St. John's Wort
Reviewed by Emma · Last updated 18 Aug 2026
Also known as: Hypericum Perforatum Flower/Leaf/Stem Extract
Plant that contains several components that can cause a negative
Addresses
Antioxidant
EWG Safety Score
2
Low
What Is St. John's Wort?
Plant that contains several components that can cause a negative reaction on skin when it is exposed to sunlight; however, this is a bigger concern when St. John’s wort is taken orally. Like most plants, it’s a rich source of antioxidants.
Clinical Evidence & References
Published Research
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International Journal of Toxicology, 2001, pages 31-39 []
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Hautarzt, April 1997, pages 249-52. []
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American Herbal Pharmacopoeia, 1997, pages 1-32 []
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