Antioxidant
Camellia sinensis Extract (Green Tea Leaf)
Also known as: Green Tea Extract, EGCG, Epigallocatechin Gallate, Tea Polyphenols
Camellia sinensis leaf extract is a polyphenol-rich botanical standardized for EGCG, the primary catechin compound associated with green tea's antioxidant and metabolic benefits. Substantial human evidence supports its use for cognitive support, metabolic health, and antioxidant protection.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Camellia sinensis Extract (Green Tea Leaf) product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Thorne Green Tea Phytosome | 92 A | $0.57 |
| 2 | Transparent Labs Fat Burner | 92 A | $0.92 |
| 3 | NOW Foods L-Theanine | 91 A | $0.16 |
| 4 | Pure Encapsulations CurcumaSorb Mind | 90 A | $2.57 |
| 5 | Pure Encapsulations Green Tea extract (decaffeinated) | 90 A | $0.52 |
| 6 | Thorne L-Arginine Plus | 87 A | $1.25 |
| 7 | Thorne PolyResveratrol-SR® | 87 A | $1.97 |
| 8 | Pure Encapsulations PureCell | 87 A | $1.28 |
| 9 | Thorne MediClear-SGS™ - Vanilla | 86 A- | $2.10 |
| 10 | Thorne Ovarian Care | 86 A- | $0.42 |
| 11 | Pure Encapsulations Teavigo | 86 A- | $1.05 |
| 12 | Zhou Nutrition Green Tea Extract | 86 A- | $0.19 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Camellia sinensis Extract (Green Tea Leaf) should I take?
The typical range is 200–600 mg daily (EGCG content typically 90–270 mg at this dosage). Long-term daily use is safe; benefits typically observed over 4–8 weeks of consistent use
When should I take Camellia sinensis Extract (Green Tea Leaf)?
With meals or as part of daily routine; can be divided into 2–3 doses. Can be taken with or without food; taking with meals may improve tolerability and absorption.
Which form of Camellia sinensis Extract (Green Tea Leaf) is best?
Powder extract. Other forms in the catalog: Capsule, Tablet, Brewed tea.
Is Camellia sinensis Extract (Green Tea Leaf) safe?
Commonly reported: Mild nausea or stomach upset (especially on empty stomach), Jitteriness or sleep disruption in sensitive individuals (due to residual caffeine ~2–4% in extract), Headache (rare).
Which Camellia sinensis Extract (Green Tea Leaf) supplement scores highest?
Thorne Green Tea Phytosome, at 92/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Antioxidant support
- Cognitive function and attention
- Metabolic health and weight management
- Cardiovascular health
- Neuroprotection
How it works
- EGCG-mediated antioxidant activity via free radical scavenging
- Modulation of cellular signaling pathways (AMPK, MAPK)
- Support for mitochondrial function
- Potential enhancement of fat oxidation and thermogenesis
Dosage
- Typical range
- 200–600 mg daily (EGCG content typically 90–270 mg at this dosage)
- Timing
- With meals or as part of daily routine; can be divided into 2–3 doses
- With food
- Can be taken with or without food; taking with meals may improve tolerability and absorption
- Duration
- Long-term daily use is safe; benefits typically observed over 4–8 weeks of consistent use
- Special populations
- Generally safe in pregnancy and lactation at typical dietary doses; pediatric and geriatric populations tolerate standard doses well
Forms
- Powder extract· 70/100
- Capsule· 70/100
- Tablet· 70/100
- Brewed tea· 70/100
Safety
Common side effects
- Mild nausea or stomach upset (especially on empty stomach)
- Jitteriness or sleep disruption in sensitive individuals (due to residual caffeine ~2–4% in extract)
- Headache (rare)
Contraindications
- Iron deficiency anemia (high polyphenol content may reduce iron absorption; separate dosing by 2+ hours)
- Severe caffeine sensitivity (use decaffeinated forms if available)
- Concurrent anticoagulation therapy (theoretical interaction; use cautiously and monitor)
Products containing Camellia sinensis Extract (Green Tea Leaf)
Top-scoring supplements in our catalog that list Camellia sinensis Extract (Green Tea Leaf) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Well-established human trial data on green tea catechins; multiple RCTs demonstrate cognitive and metabolic effects. EGCG standardization (45%) is a recognized quality marker. Grade B rather than A due to modest effect sizes in some domains and heterogeneous study designs.
Grade B: Some human trials support key claims; further confirmation needed.
Cited research for Camellia sinensis Extract (Green Tea Leaf)
Clinical studies referenced across Formulate guides that mention camellia sinensis extract (green tea leaf). Each links to the full study page with PubMed source + the guides that cite it.
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.