Camellia sinensis polyphenols — and specifically epigallocatechin gallate (EGCG) — are among the most-studied plant antioxidants in dermatology. Photoprotective (reduces UVB-induced erythema and DNA damage), anti-androgenic in scalp/sebum contexts, and synergistic with caffeine. Youth To The People built the kale-spinach-green-tea antioxidant serum around it; The Ordinary's Caffeine + EGCG eye serum is the mass benchmark.
Benefits
potent antioxidant via EGCG and other catechins
modest topical photoprotection
anti-inflammatory in acne and rosacea contexts
Example uses
antioxidant serums (YTTP Superfood)
eye treatments
post-sun recovery
Mechanism of action
Polyphenol-dense extract of unfermented Camellia sinensis leaves; the active catechin fraction is dominated by epigallocatechin gallate (EGCG, 50–80% of total catechins) plus EGC, ECG, and EC. EGCG is a multi-mechanism actor: it scavenges peroxyl and hydroxyl radicals via its eight phenolic hydroxyls, inhibits UV-induced cyclobutane pyrimidine dimer formation (DNA-damage attenuation), suppresses 5α-reductase (the sebum-and-androgenic-acne angle), and modulates MMP-1 and MMP-9 expression. Photoprotective against UVB-induced erythema in standardised MED studies.
Clinical evidence · High
Strong basic-science and ex-vivo skin literature; multiple RCTs on photoprotection, acne, and rosacea — particularly for standardised EGCG isolates rather than whole-leaf extracts.
Effective concentration range
1–3% (EGCG isolate); 5–10% (whole-leaf extract)
Formulation notes
Concentrated EGCG isolate (1–3%) outperforms whole-leaf extract for clinical claims. Stability is poor — pairs with vitamin E and ferulic acid for protection. Pairs with caffeine for compound antioxidant + microcirculatory effect.
Watchouts
EGCG oxidizes to brown — color change in serum = lost activity. Chinese green tea sourcing carries the same supply-transparency questions as any imported botanical.
EGCG oxidation in formulation is the principal honesty problem — the molecule browns visibly as it oxidises to theaflavins and dimers, and a brown serum has lost most of its claimed activity. Many products on the shelf are well past the point of efficacy. Sourcing transparency from Chinese green tea supply remains a contested ESG question.
Market positioning
Sold as the antioxidant-with-a-clean-narrative — calorie-aware Youth To The People and dermatology-leaning Innisfree both lean on it. The molecule earns the positioning when formulated well; the gap is mostly stability and dose, not biology.
Comedogenicity
0 / 5
Sensitisation risk
Low
INCI & aliases
Camellia Sinensis Leaf Extract
egcg · epigallocatechin gallate · camellia sinensis · green tea extract · matcha · kale
Clean beauty perception
Strongly positive — peer-reviewed and culturally familiar.