Green Tea Extract
Also known as: Camellia Sinensis Leaf Extract, EGCG, Epigallocatechin Gallate, Green Tea Polyphenols
Description
Green tea extract is derived from the leaves of Camellia sinensis. It is rich in polyphenols called catechins, with epigallocatechin-3-gallate (EGCG) being the most abundant and biologically active. It is one of the most well-researched botanical antioxidants in dermatology, with demonstrated benefits against photoaging, acne, and oxidative stress.
Mechanism of Action
EGCG and other catechins neutralize reactive oxygen species (ROS) and chelate transition metals, preventing oxidative damage to cellular components. EGCG inhibits 5α-reductase, reducing sebum production. It suppresses NF-κB activation, decreasing pro-inflammatory cytokine release. Anti-angiogenic properties via VEGF inhibition contribute to reducing rosacea-related erythema. Catechins also inhibit matrix metalloproteinases (MMPs), protecting collagen and elastin from degradation.
Indications
- Photoaging
- Oily and acne-prone skin
- Rosacea (adjunct)
- UV-induced erythema
- Oxidative stress protection
- Sebum regulation
Available Concentrations
Side Effects
- Mild irritation (rare)
- Contact sensitization (very rare)
- Green tinting at very high concentrations
Contraindications
- Known allergy to Camellia sinensis
Pregnancy Category
Not classified (topical use generally considered safe)