Botanicals
Green Tea Extract — timing, dose & interactions
Concentrated catechins (EGCG) from green tea, often with caffeine. Rare but serious liver injury has been reported with extract capsules.
Also known as EGCG
Timing
When to take it
Always with food — liver injury has mostly been linked to concentrated extracts on an empty stomach.
Dose note. EFSA found liver risk from ≥800 mg EGCG/day in supplements. Check EGCG and caffeine per serving.
Interactions
Green Tea Extract with other supplements
Safety
Medications & health conditions
Green tea reduces nadolol levels. High doses of green tea lowered blood levels of the beta-blocker nadolol.
Green tea extract and bortezomib. EGCG blocked the cancer drug bortezomib in lab studies. Avoid during treatment unless your oncologist agrees.
Concentrated green tea in pregnancy. Catechins may reduce folate availability, and extracts add caffeine. Avoid concentrated extracts.
Green tea extract has caused liver injury. Liver injury, sometimes severe, has been reported mainly with extract capsules. Avoid with liver disease.
Buying guide
What to look for on the label
Green Tea Extract
- Label states EGCG and caffeine per serving
- Decaffeinated if stacking with coffee
FAQ
Common questions
When is the best time to take Green Tea Extract?
Breakfast or Lunch. Always with food — liver injury has mostly been linked to concentrated extracts on an empty stomach.
Should Green Tea Extract be taken with food?
Yes. Taking it with a meal reduces stomach upset.
Can you take Green Tea Extract with Iron?
Separate them by at least 2 hours. Keep green tea extract at least 2 hours away from iron supplements.
Can you take Green Tea Extract with Caffeine?
Yes, but count the caffeine in the extract toward your daily total. Check the label; choose a decaffeinated extract if you already drink coffee.
Sources