Hypericum Perforatum Flower/Leaf/Stem Extract Average Plant extracts Hydration Anti-Ageing Hypericum Perforatum Flower/Leaf/Stem Extract description _Hypericum perforatum_ flower/leaf/stem extract (also known as St. John’s wort) is a 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 taken orally. Like most plants, it’s a rich source of antioxidants. Related ingredients: Hypericum Extract Hypericum Perforatum Extract St. John's Wort