What it is
Regulatory status: Food beverage; concentrated extracts are sold as dietary supplements.
Mechanism evidence: human
At a glance
What it is, why people use it, the evidence, and what to know before trying it.
Why people use it
- Caffeine-related alertness
- Small changes in total and LDL cholesterol in some studies
Evidence at a glance
Unsweetened brewed green tea can be a reasonable beverage choice. Evidence supports, at most, modest marker changes rather than dramatic weight loss or disease prevention. Extract capsules are a different, higher-risk intervention and should have their own record.
Confidence: moderate
Safety notes
Known side effects, interactions and use limits from reviewed sources.
Brewed green tea is generally safe for adults but contains caffeine and can disturb sleep or cause palpitations in sensitive people. Concentrated extracts can cause gastrointestinal symptoms and rare liver injury and can interact with nadolol, atorvastatin and other medicines.
Seen in protocols
Public protocols that include Green tea. Open one to see the full context and source.
Common dose and timing
Amount and timing patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.