Fragrance Synthetic and Natural

No known benefits

Peppermint description

Both the oil and the extract form of peppermint can have beneficial properties, but they can also have a sensitising effect on skin. Peppermint oil is a more potent sensitizer than peppermint water. Peppermint is a common cause of sensitivity on the face, particularly around the mouth, as it’s frequently used as flavoring in toothpastes. The oil contains 44% menthol, an ingredient believed to be largely responsible for peppermint oil’s benefits as well as its risks.

Peppermint references

  • Asian Pacific Journal of Tropical Biomedicine, August 2015, pages 601-611
  • Contact Dermatitis, April 2008, pages 143-150 and January 2008, pages 9-14
  • Seminars in Cutaneous Medicine and Surgery, Volume 32, 2013, page 143
  • Basic and Clinical Pharmacology and Toxicology, June 2006, pages 575-581

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