St. John's Wort


Plant extracts

No known benefits

St. John's Wort description

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.

St. John's Wort references

  • International Journal of Toxicology, 2001, pages 31-39
  • Hautarzt, April 1997, pages 249-52.
  • American Herbal Pharmacopoeia, 1997, pages 1-32

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.