What is the recommended dosage for Green Tea Extract?

General: 250-500 mg/day green tea extract; Skin Health: 250-500 mg/day standardized to 50-90% EGCG

What are the side effects of Green Tea Extract?

Potential side effects include: Nausea (especially on empty stomach), Insomnia and jitteriness (caffeine content), Rare hepatotoxicity at high doses (> 800 mg EGCG/day), Reduced iron absorption.

What is green tea extract and how may it support skin health?

Green tea extract is rich in catechins, particularly EGCG, with potent antioxidant and anti-inflammatory properties. Clinical studies suggest oral green tea catechins may provide photoprotection against UV damage, reduce skin redness from sun exposure, and improve skin elasticity and moisture. EGCG may also inhibit enzymes that break down collagen.

What dosage of green tea extract has been studied for skin benefits?

Skin-related studies have used 250–540 mg of green tea catechins per day, or 2–6 cups of green tea equivalent. A photoprotection study used 540 mg of green tea catechins with vitamin C for 12 weeks. The minimum UV protection factor was observed after 6 weeks of supplementation.

What are the potential side effects of green tea extract?

Common side effects include nausea, insomnia, and digestive discomfort. High doses of EGCG (above 800 mg) have been associated with liver injury in rare cases. Green tea extract contains caffeine, which may cause jitteriness in sensitive individuals. Decaffeinated extracts are available. Take with food to reduce GI side effects.

Green Tea Extract
Green Tea Extract

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Còn được gọi là: EGCG, Camellia sinensis Extract, Green Tea Polyphenols, GTE

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About

Green tea extract is rich in catechin polyphenols, particularly EGCG, which inhibits UV-induced MMP expression and reduces NF-kB activation. A systematic review found oral green tea polyphenols (250-1,080 mg/day) increased the minimal erythema dose by approximately 25%, providing internal photoprotection.

How It Works

Rich in catechin polyphenols, particularly epigallocatechin-3-gallate (EGCG); potent antioxidant that inhibits UV-induced MMP expression, reduces NF-kB activation, may protect against DNA damage, and modulates inflammatory cascades in photoaged skin.

Evidence For Conditions

Tình trạng	Xếp hạng	Nghiên cứu	Người tham gia
UV Protection (Internal Photoprotection)	B	8	450	Xem →
Acne	D	3	150	Xem →

Side Effects

Nausea (especially on empty stomach)
Insomnia and jitteriness (caffeine content)
Rare hepatotoxicity at high doses (> 800 mg EGCG/day)
Reduced iron absorption

Drug & Supplement Interactions

Iron supplements (reduces absorption — separate by 2+ hours)
Stimulant medications (additive caffeine effects)
Blood thinners (may have mild antiplatelet effects)
Hepatotoxic medications (potential additive liver stress at high doses)

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Related Ingredients

Aloe Vera Turmeric (Curcumin) Grape Seed Extract Saw Palmetto

Thông tin nhanh

Liều lượng: General: 250-500 mg/day green tea extract; Skin_Health: 250-500 mg/day standardized to 50-90% EGCG
Dạng bào chế: capsule tablet powder liquid extract
Nguồn tự nhiên: Green tea leaves (Camellia sinensis), Matcha, White tea
Giới hạn trên: 800 mg EGCG/day (doses above may cause hepatotoxicity in rare cases)
Thời điểm tốt nhất: With meals (may cause nausea on empty stomach); avoid with iron-rich foods

Tóm tắt bằng chứng

UV Protection (Internal Photoprotection) B

Acne D

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