A complete safety, timing, and dosage guide for combining Copper with Green Tea Extract (EGCG) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take copper and green tea extract (EGCG) together safely; there is no significant interaction between them.
Copper and green tea extract together are safe to take. The main catechin in green tea, EGCG, does not meaningfully interfere with copper absorption. No need to separate your doses or change your routine.
Copper is absorbed primarily in the stomach and upper small intestine via the Ctr1 transporter, while EGCG is absorbed later in the small intestine and is heavily metabolized in the liver. Green tea polyphenols like EGCG can chelate divalent metal ions in the digestive tract, which is why teas reduce absorption of non-heme iron in some people. However, copper is not as sensitive to polyphenol inhibition as iron, and there is no reliable evidence that green tea extract lowers copper status in healthy adults. At typical supplement doses, EGCG and copper simply do not compete for the same absorption pathways in a clinically meaningful way.
You can take both supplements together with food to reduce any chance of stomach upset. There is no need to space them apart, but if you want to be extra cautious, take green tea extract 30 minutes before or after your copper supplement. Take copper with a meal containing some protein and vitamin C for optimal absorption. If you miss a dose, simply take it at your next meal and resume your normal schedule the next day.
Copper form can affect absorption: cupric oxide is poorly absorbed compared to copper sulfate or copper bisglycinate, but this is a general copper property, not an EGCG interaction. Green tea extract standardized to 40–50% EGCG is more potent than brewed green tea, but even so, the polyphenol content is not high enough to deplete copper in people eating adequate diets. If you use copper as a chelated form like copper bisglycinate, it is even more stable in the gut and less likely to bind with EGCG.
Copper is frequently included in multivitamins and trace mineral formulas alongside zinc and iron, because zinc supplementation can induce copper deficiency. Green tea extract is common in weight-loss and antioxidant stacks, but a dedicated copper plus EGCG stack is not a standard pre-formulated combination.
Yes, you can take them at the same time. There is no known competition between copper and EGCG that would reduce copper absorption or cause side effects. Taking them together with food is perfectly fine.
Yes, it is safe to combine them daily. Green tea extract does not significantly affect copper status, so you can maintain your daily routine without concern. Just stay within recommended doses for both supplements.
You do not need to wait at all. If you want to be cautious, waiting 30 minutes is more than enough, but it is not required based on current evidence.
No, they do not meaningfully compete. Copper uses dedicated transport proteins like Ctr1, while EGCG is absorbed separately and does not block this pathway. Unlike iron, copper is not strongly inhibited by tea polyphenols.
People with Wilson's disease, current liver problems, or a known allergy to green tea extract should avoid this combination. If you take high-dose zinc for a medical reason, talk to your doctor because zinc itself can lower copper levels, but that is not related to green tea.
Take both with food. Food buffers the stomach and can improve copper absorption, while green tea extract is less likely to cause nausea when taken with a meal. There is no benefit to taking either on an empty stomach.
Reviewed by Caroline M. on April 8, 2026 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.