Origanum Vulgare Flower Extract

Origanum vulgare (oregano) flower extract is an aromatic botanical extract that often contains sensitizing/irritating constituents (e.g., thymol/carvacrol-type phenolics and fragrance-like terpenes) even at low cosmetic use levels. Clinical experience and patch-test literature for oregano and related Lamiaceae botanicals show a meaningful risk of irritant and allergic contact dermatitis, particularly in eczema-prone or barrier-impaired patients and when layered with other actives. Given the variability of extract composition and the disproportionate risk in highly sensitive populations, it warrants a significant irritancy rating. Safety Notes: In mass-market leave-on skincare, Origanum vulgare (oregano) flower extract is most often used as a minor botanical/antioxidant or part of a preservative/deodorizing complex, where finished-product use levels commonly fall in the 0.0001–0.05% range (especially when supplied in diluted glycerin/propylene glycol bases). Higher concentrations are observed in “natural/organic” acne, clarifying, or deodorizing leave-on products and in some rinse-off cleansers where brands position oregano as an active botanical, reaching ~0.5–2.0% in the finished formula; above this, odor/irritancy and stability constraints typically limit OTC consumer usage.