Hypericum Perforatum (St. John's Wort) flower extract is a plant-derived ingredient used in skincare for its anti-inflammatory, antioxidant, and skin-conditioning properties, attributed to constituents such as hypericin, flavonoids, and hyperforin. It is applied topically to support wound healing and to soothe irritated skin.
| Reported effect | How often | Notes |
|---|---|---|
| Photosensitivity / phototoxic reactions | Uncommon | Hypericin can increase skin sensitivity to UV light, potentially causing sunburn-like reactions with sun exposure. |
| Contact dermatitis / allergic skin reaction | Uncommon | Redness, itching, or rash in sensitized individuals. |
| Skin irritation or stinging | Rare | Mild transient irritation at the application site. |
| Severe phototoxic blistering | Very rare | Reported mainly with high concentrations and significant UV exposure. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.