Oregon Esthetician State Board

Which plant extract is known for its ability to inhibit melanin production and reduce surface hyperpigmentation?

1. Licorice

2. Horsechestnut

3. Peppermint

4. Sandalwood

The correct answer is: Licorice

Licorice extract is well-known in skincare for its ability to inhibit melanin production, making it an effective ingredient for reducing hyperpigmentation. The active component in licorice, known as glabridin, has been shown to suppress the enzyme responsible for producing melanin, which can help even out skin tone and reduce dark spots. This particular property makes licorice extract a popular choice in formulations targeting hyperpigmentation issues. On the other hand, horsechestnut is primarily valued for its anti-inflammatory and circulation-boosting properties, rather than for addressing pigmentation. Peppermint extract is often used for its cooling sensation and refreshing qualities, but it does not have a significant effect on melanin production. Sandalwood extract is known for its soothing and anti-inflammatory properties, as well as its aromatic benefits, yet it does not directly influence melanin synthesis or reduce hyperpigmentation to the same extent as licorice extract. Thus, licorice's unique ability to inhibit melanin production is what sets it apart in this context.