Green Tea … Safety & Interactions
Lv Cha · Folium Camelliae Sinensis
Contraindications
- Cold weak digestion with loose stools and no heat signs
- Use of concentrated catechin supplements in people with active liver injury unless specifically supervised
Cautions
- Brewed green tea and concentrated green tea extract are not interchangeable; most serious liver-safety concerns involve high-dose supplements rather than ordinary tea.
- Caffeine sensitivity may produce insomnia, palpitations, anxiety, reflux, or tremor in some users.
- Heavy tea intake around meals may reduce nonheme iron absorption in susceptible people.
Drug Interactions
| Drug Class / Substrate | Mechanism | Severity | Source |
|---|---|---|---|
| Possible additive stimulant effects with caffeine-containing drugs or supplements | |||
| Very high intake may complicate warfarin management because tea leaves contain vitamin K, although ordinary beverage use is usually less problematic | |||
This information is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before using herbal medicines, especially if you take prescription medications.