Epilobium angustifolium Flower/Leaf/Stem Extract, often referred to as Fireweed or Willowherb extract, is derived from the aerial parts of Epilobium angustifolium, a perennial plant in the Onagraceae family. Botanical analyses show it is rich in polyphenols such as ellagitannins (e.g., oenothein B), flavonoids (quercetin, myricetin, kaempferol, rutin), phenolic acids (gallic, caffeic, chlorogenic and rosmarinic acids) and small amounts of essential oils and fatty acids. These bioactive constituents impart strong antioxidant activity, protecting formulations and the skin from oxidative damage while scavenging reactive oxygen species. The tannins and flavonoids also exhibit pronounced anti‑inflammatory and soothing effects, inhibiting lipoxygenase and cyclo‑oxygenase pathways that generate pro‑inflammatory mediators. Combined, these properties make Epilobium angustifolium extract valuable in moisturizers, serums, toners, masks and acne treatments where anti‑inflammatory, antioxidant and sebum‑balancing actions are required.

Beyond skin applications, Epilobium angustifolium extract offers targeted benefits for scalp and hair. It inhibits 5‑α‑reductase, thereby reducing excess sebum production and down‑regulates inflammatory markers such as TLR2, hBD2, hBD3 and IL‑8. The extract stimulates involucrin synthesis to strengthen the stratum corneum, reduces flake formation and maintains a healthy, non‑oily scalp. These sebo‑regulating and anti‑dandruff effects, combined with the extract’s antioxidant and antimicrobial properties, make it suitable for anti‑dandruff shampoos, scalp serums, conditioners and leave‑on hair treatments.