Herb Profile
Green Tea Extract
Botanical profile with evidence, safety, and practical fit.
Last reviewed: •4 human studies cited
B ModerateUse extra caution — Safety evidence: limited human safety evidence and rare case reports. Details
- Evidence
- Strong Human Evidence
- Typical onset
- Varies by prep
- Safety rating
- Moderate caution
- Best for
- Metabolic
- Avoid / review if
- Liver Disease, Stimulants
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Green Tea Extract
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Safety & Cautions
Safety evidence: limited human safety evidence and rare case reports. Concentrated, catechin rich green tea extracts can cause liver injury, with risk influenced by dose and fasting exposure; this does not apply automatically to brewed tea or food use.
60%
Moderate caution — review before use
Detailed safety fields
Pregnancy, breastfeeding, and contraindications
- - Liver Disease
- - Stimulants
Safety classifications
- - Liver-Sensitive: Liver-related caution language appears in the profile.
Full safety note
- - Safety evidence: limited human safety evidence and rare case reports. Concentrated, catechin rich green tea extracts can cause liver injury, with risk influenced by dose and fasting exposure; this does not apply automatically to brewed tea or food use.
Safety labels
- - Liver-Sensitive
Evidence Summary
Evidence lens
Most useful for practical interpretation when safety context also fits.
StrongStrong Human Evidence
Human clinical evidence: Present in source signals
Mechanistic / preclinical: Mechanism mapped — Metabolic Regulation · Vascular Function Support
Research maturity: More interpretable — Long Term Human Evidence May Be Limited.
Safety boundary: Safety note available — Safety evidence: limited human safety evidence and rare case reports.
This profile cites 4 human studies.
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
A
Strong
Multiple RCTs, consistent direction, adequate effect size
B
Moderate
Some RCTs or consistent observational data in humans
C
Preliminary / Mixed
Animal or in-vitro only, or conflicting human data
D
Traditional / Theoretical
Traditional use only; no controlled human trials
Clinical Study Summaries (4)Cited studies informing this profile. RCTs and reviews shown first.
| Study | Type | Sample | Source |
|---|---|---|---|
Common Herbal Dietary Supplement-Drug Interactions Asher GN et al. (2017) | — | — | PubMed → |
PubMed indexed authors (2012) | — | — | PubMed → |
Chen IJ et al. (2016) | — | — | PubMed → |
PubMed | — | — | PubMed → |
Dosing & Timing
Dose guidance
300 800 mg EGCG/day
How Green Tea Extract Works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Green Tea Extract Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Mechanisms & Biological Pathways
Preclinical pathways
Proposed mechanisms from in vitro and animal research; these do not confirm clinical outcomes in humans.
Metabolic RegulationVascular Function Support
Condition guides
Compare & Sourcing
Compare side-by-side tradeoffs or verify active marker guidelines.
Review available sources for Green Tea Extract
Independent database mapping — evaluated separately from safety and efficacy scores.
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Affiliate-ready sourcing
Green Tea Extract product picks
Affiliate recommendations for Green Tea Extract. Review safety, dose, and product quality before buying.
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Product Form & Quality Guidelines
When sourcing Green Tea Extract, verify the label for:
- Standardized Extract: Confirm active content percentages on the supplement facts panel (e.g. standardized to specific marker compounds) rather than simple raw herb weights.
- Third-Party Testing: Look for independent purity labels (USP, NSF, ConsumerLab, or Eurofins) to ensure the product is free from heavy metals, solvents, and contaminants.
- Form Bioavailability: Ensure the form matches evidence-supported configurations (e.g. standardized active extracts like bacosides, withanolides, or curcuminoids) for optimal onset and digestion tolerance.
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Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
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