A complete safety, timing, and dosage guide for combining Green Tea Extract (EGCG) with St. John's Wort — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take St. John's Wort and green tea extract (EGCG) together; they do not have a known significant interaction.
St. John's Wort and green tea extract (EGCG) together are considered safe for most adults. They use different metabolic pathways and do not block each other's absorption or breakdown. You can add green tea extract without worrying about a negative reaction.
St. John's Wort is a well-known inducer of liver enzymes, particularly CYP3A4, as well as P-glycoprotein, which can speed up clearance of many drugs and supplements. Green tea's active compound EGCG, however, is primarily metabolized through phase II conjugation pathways like glucuronidation and sulfation, not the CYP3A4 enzyme system. Because of this, St. John's Wort is unlikely to change EGCG levels in your body. Conversely, EGCG does not meaningfully inhibit or induce the enzymes that process the active constituents of St. John's Wort. The two compounds simply travel along separate handling routes, so combining them does not create a meaningful interaction.
I recommend taking St. John's Wort in the morning with breakfast and green tea extract with lunch or mid-afternoon. Taking both with food reduces the chance of nausea and keeps absorption steady. If you prefer to take them together, a single meal early in the day works fine. For most people, separating them by 2–3 hours is not necessary but can help if you feel sensitive. Keep your total EGCG intake from all supplement and tea sources under 800 mg per day.
Most St. John's Wort extracts are standardized to hypericin or hyperforin, but hyperforin content varies by brand and specifically affects drug interactions rather than green tea extract. For green tea extract, choose a product standardized to at least 50% EGCG, as lower-quality extracts may contain more caffeine or other catechins. Taking the extract with food can reduce potential stomach discomfort, and decaffeinated or time-released versions are easier on sensitive stomachs.
This pair is not a classic supplement stack, but it occasionally appears in combination mood support and weight management formulas alongside omega-3 fatty acids and vitamin D.
Yes, I can take them together because they do not share a significant metabolic pathway. I just prefer to take them with food to avoid stomach upset. If I ever feel nauseated, I separate them by a couple of hours.
Yes, it is safe for me to take this pairing daily as long as I keep my green tea extract dose in the moderate range. I stay within the recommended EGCG limit of 800 mg per day and watch for any unusual symptoms like nausea or fatigue. St. John's Wort is safe for long-term use for most people, but I still get periodic check-ins with my doctor.
I do not need to wait at all because they do not compete for absorption. I can take them together, but if I experience nausea, I wait 2 to 3 hours and take the green tea extract with a meal.
No, they do not compete because they use different transport and enzyme pathways. St. John's Wort is absorbed quickly, while EGCG is handled by phase II metabolism. Taking them with food does not cause one to block the other.
I would not recommend this combination to anyone who is pregnant or breastfeeding. People on antidepressants, birth control, or blood thinners should avoid St. John's Wort entirely because it changes how these drugs work. Those with liver conditions should also avoid high-dose green tea extract.
I take both with food to reduce nausea and ensure steady absorption. Green tea extract can irritate an empty stomach, and St. John's Wort is better absorbed with a meal that contains some fat. Breakfast or lunch is a great option.
Reviewed by Caroline M. on April 8, 2025 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.