Yogurt- There is no research showing that yogurt is effective when applied topically on skin.
Yucca Extract- Plant extract that can have soothing benefits.
Yarrow Extract- Extract for which there is little research showing it to have any benefit for skin.
Yeast- Group of fungi that ferment sugars. Yeast is a source of beta-glucan, which is a good antioxidant.
Yerba Mate Extract- Plant ingredient used in the preparation of the most popular tea-like beverage in South America
Ylang Ylang- Fragrant, volatile oil that can also be a skin sensitizer.