Can I Take Green Tea Extract (EGCG) with Spironolactone?

Brewed green tea and concentrated EGCG capsules should be evaluated separately. Ordinary tea drinking is not the same exposure as an extract providing hundreds of milligrams of EGCG. If you take spironolactone, bring the supplement's ingredient panel and daily amount to the prescriber or pharmacist before adding it. [1]

Spironolactone is used for acne because of its hormonal effects. A green tea supplement is not a necessary part of that treatment, and choosing an “antioxidant” product does not by itself identify a useful acne treatment. [2]

What is the difference between tea, extract and EGCG?

EGCG, or epigallocatechin gallate, is one of green tea's catechins. A label may report the weight of the whole extract, the amount of total catechins, the EGCG amount or all three. Those numbers are not interchangeable.

For example, a product described as 500 mg of extract with 50% EGCG would supply 250 mg EGCG per serving, assuming the percentage refers to that extract amount. If the serving is two capsules, one capsule supplies half that amount. This is an arithmetic example, not a recommended dose.

Check these details together:

EFSA's assessment distinguishes customary green tea infusions from supplements. It found evidence of liver-enzyme increases at supplement doses of 800 mg EGCG daily or more and could not establish a safe supplemental dose from the available data. This does not make 799 mg a guaranteed safe threshold. [1]

What did the liver studies actually find?

In the Minnesota Green Tea Trial, 1,075 postmenopausal women were assigned to extract containing 843 mg EGCG daily or placebo for one year. ALT elevations occurred in 6.7% of the extract group and 0.7% of the placebo group. [3]

This was a study of the extract, not the extract combined with spironolactone. It identifies a concern with concentrated supplementation without quantifying an additional risk from the combination.

Spironolactone itself has been linked to rare cases of clinically apparent liver injury. LiverTox describes a small number of reports, often beginning four to eight weeks after treatment started. The reported cases summarized there generally recovered after stopping the medicine. That history does not establish a predictable “combined liver burden” that can be calculated by adding two separate risk estimates. [4]

Does EGCG raise spironolactone blood levels?

Human enzyme studies do not support treating a laboratory finding as a measured spironolactone interaction.

In one study, 11 healthy volunteers took decaffeinated green tea extract for 14 days. The investigators found no significant change in the pharmacokinetics of alprazolam, used as a CYP3A4 probe, or in the CYP2D6 measure. [5]

Another study gave 42 volunteers a catechin product containing 800 mg EGCG daily for four weeks. Buspirone exposure increased by 20%, suggesting a small change in CYP3A4 activity; the other tested enzyme measures did not change significantly. [6]

Neither experiment tested spironolactone or its active metabolites. Their different results show why the product, dose and specific medicine matter. They do not supply a spironolactone dose adjustment or prove that separating the capsule and tablet by several hours prevents an interaction.

Is there a demonstrated acne benefit?

A four-week randomized trial assigned 80 women with post-adolescent acne to decaffeinated green tea extract or placebo; 64 completed the study. The daily extract supplied 856 mg EGCG. Some facial regions showed fewer inflammatory lesions, but total lesion counts did not differ significantly between groups. [7]

The trial was not a study of adding EGCG to spironolactone. Its dose also should not be adopted as a personal supplement target just because it was used in research.

The AAD's 2024 acne recommendations include spironolactone as a treatment option. The guideline did not find sufficient evidence to make recommendations for alternative therapies such as plant-based products, vitamins and related interventions. [2]

If acne remains active, review the prescribed regimen, how consistently it is used and the time allowed for response. Adding an extract makes that review harder when several changes happen at once.

Do you need liver or potassium tests?

Keep the monitoring plan attached to the actual medicines and medical history. Spironolactone's product information addresses potassium and kidney-function monitoring, particularly when other factors increase potassium. A liver panel answers a different question. [8]

The need for additional testing after extract use depends on the amount, duration, symptoms, prior liver disease and other products taken. A normal baseline liver panel cannot guarantee that an extract will remain well tolerated. Testing should lead to a clear decision, not serve as automatic permission to start a concentrated supplement.

Bring the dates that spironolactone and the extract were started, any dose changes and previous results. That timeline helps the clinician assess a new symptom or laboratory change.

What if you are already taking both?

Do not increase the extract while the combination is being reviewed. Send or bring the label, the number of capsules taken daily and a complete medication list. Ask whether to discontinue the supplement and whether testing is indicated; do not independently change a prescription used for another condition such as heart failure.

Yellowing of the eyes or skin, dark urine, significant upper-abdominal pain or nausea with unusual fatigue warrants prompt assessment. Explain all supplements being used rather than attributing the symptoms to one product without evaluation. [9]

Should you replace it with another antioxidant?

Choose a replacement only if there is a specific treatment or nutritional reason for it. Zinc, vitamin C, NAC and spearmint products should not be treated as interchangeable acne therapies merely because their labels use similar marketing language.

The useful outcome is clearer skin with a manageable regimen. A follow-up that reviews response, tolerability and the existing treatment plan is more informative than repeatedly switching between supplement blends. [2]

References

1. EFSA. Assessment of green tea catechin safety, 2018.
2. American Academy of Dermatology. Updated acne treatment recommendations, 2024.
3. Dostal and colleagues. Minnesota Green Tea Trial safety results, 2015.
4. NIH LiverTox. Spironolactone.
5. Donovan and colleagues. Green tea extract and CYP3A4/CYP2D6 activity in volunteers, 2004.
6. Chow and colleagues. Repeated green tea catechin administration and human CYP activity, 2006.
7. Lu and Hsu. Green tea extract in post-adolescent acne: randomized trial, 2016.
8. Pfizer. Aldactone prescribing information, revised November 2025.
9. NIH LiverTox. Green tea.