Quick Comparison
| Green Tea Extract (EGCG) | Salicylic Acid | |
|---|---|---|
| Typical Concentration | Topical: 1-5% green tea extract in formulations. Look for products with EGCG specifically listed. Oral: 400-800 mg green tea extract (standardized to EGCG) daily. Apply topical products before sunscreen for additional photoprotection. | Concentrations: 0.5-2% for daily use products (cleansers, toners, serums). Up to 30% for professional peels. Start with 0.5-1% every other day and increase. Leave-on products are more effective than wash-off. For body acne (back, chest): 2% is standard. |
| Application | Topical (serum, cream, toner) or oral (supplement, tea). Topical is effective for localized skin benefits. | Topical (cleanser, toner, serum, spot treatment, body wash, peel). Leave-on products provide better efficacy than wash-off. |
| Research Papers | 9 papers | 10 papers |
| Categories |
Mechanism of Action
Green Tea Extract (EGCG)
EGCG scavenges ROS (superoxide, hydroxyl radical, peroxynitrite) and chelates iron/copper that catalyze Fenton reactions. Inhibits MMP-2 (gelatinase A) and MMP-9 (gelatinase B) that degrade collagen types I, III, IV and elastin in photoaged skin — these enzymes are UV-upregulated via AP-1 and NF-kappa B. Reduces sebum by inhibiting 5-alpha reductase type 1 (testosterone to DHT conversion in sebaceous glands). Anti-inflammatory: NF-kappa B inhibition (I-kappa B degradation prevention), COX-2 suppression, TNF-alpha/IL-1beta reduction. Promotes keratinocyte differentiation via involucrin and filaggrin upregulation. Catechol structure enables dual antioxidant and metal-chelating activity. Topical EGCG reduces UV-induced erythema and prevents collagen degradation when used before sun exposure.
Salicylic Acid
Salicylic acid (ortho-hydroxybenzoic acid) is a lipophilic beta-hydroxy acid—the ortho hydroxyl enables sebum and follicular lipid solubility, unlike water-soluble AHAs. It penetrates the pilosebaceous unit and induces desmolysis: disruption of desmosomal attachments and corneodesmosomes, accelerating desquamation of pore-clogging debris. Inside the follicle, it dissolves sebum and keratin plugs (comedolysis). Salicylic acid inhibits COX-1 and COX-2, reducing prostaglandin synthesis—the same anti-inflammatory mechanism as aspirin—decreasing erythema and swelling. Bacteriostatic against Cutibacterium acnes through membrane disruption and pH reduction. May reduce sebum production. Small size (138 Da) and lipophilicity enable follicular penetration to depths AHAs cannot reach.
Risks & Safety
Green Tea Extract (EGCG)
Serious
None topically. Oral high-dose EGCG supplements have rare liver toxicity reports.
Rare
Contact dermatitis.
Salicylic Acid
Common
Dryness, peeling, mild stinging. Over-use can compromise the skin barrier.
Serious
Salicylate sensitivity (rare) — avoid if allergic to aspirin. Not recommended in pregnancy at high concentrations.
Rare
Severe peeling from over-application.
Full Profiles
Green Tea Extract (EGCG) →
Epigallocatechin gallate (EGCG) is the primary polyphenol in green tea and one of the most potent topical antioxidants. It has been shown to reduce UV damage, decrease sebum production, reduce inflammation, and inhibit the enzymes that break down collagen and elastin. Green tea extract is one of the few antioxidants with evidence for both topical and oral skin benefits.
Salicylic Acid →
The only beta-hydroxy acid (BHA) used in skincare. Salicylic acid is oil-soluble, meaning it can penetrate into pores and dissolve the sebum and dead skin that cause blackheads and acne. This makes it fundamentally different from AHAs (which only work on the skin surface). It also has direct anti-inflammatory properties, reducing the redness and swelling of acne lesions.