What it’s for
- A caffeinated drink
Tea brewed from Camellia sinensis leaves with relatively little oxidation.
Purpose, evidence and practical considerations.
Tea can provide caffeine and plant compounds. Beverage use differs from concentrated extracts; evidence does not establish it as a general disease-prevention treatment.
Confidence: moderate
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.
Brewed green tea supplies caffeine and catechins such as EGCG. These can affect alertness and several cardiometabolic markers, but beverage doses are lower and less concentrated than extract capsules, and findings from extracts should not be silently applied to ordinary tea.
Regulatory status: Food beverage; concentrated extracts are sold as dietary supplements.
How people use it, with their schedules, context and original sources.
occasional cup
often · on waking
Amount and timing patterns reported in public protocols; these are observations, not instructions. Private and hidden usage is excluded.
These share a protocol with this intervention. This does not establish that they work together or are suitable alternatives.