A complete safety, timing, and dosage guide for combining Green Tea Extract (EGCG) with Magnesium (Citrate, Glycinate, Oxide, Threonate) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take magnesium and green tea extract together—the combination is safe and has no known interactions.
Magnesium and green tea extract together are a safe combination with no known negative interactions. Taking them as part of your daily supplement routine is generally fine, and you do not need to be concerned about impaired absorption or side effects.
Magnesium is absorbed in the small intestine through TRPM6/7 channels and paracellular routes, while EGCG (epigallocatechin gallate) from green tea extract is absorbed via passive diffusion and efflux transporters such as MRP1/2. These separate absorption pathways do not compete with each other. Although EGCG can chelate iron, zinc, and copper, it has minimal binding affinity for magnesium, so it does not interfere with magnesium absorption. Furthermore, magnesium is not metabolized by cytochrome P450 enzymes, so there is no enzyme-related interaction with EGCG. The only theoretical concern is the mild caffeine content in green tea extract, which can slightly increase urinary magnesium excretion, but this effect is negligible at standard doses.
You can safely take magnesium and green tea extract together, but for best results, take green tea extract in the morning with breakfast and magnesium in the evening with a light snack. This spacing avoids any potential, though unlikely, competition for gut absorption and supports a steady intake. If you use a high-dose green tea extract, split it into two doses. If you miss a dose, just take it with your next meal; do not double up. For maximal absorption, choose magnesium glycinate or citrate and avoid taking it with high-fiber meals, as fiber can bind magnesium.
Magnesium forms differ in solubility and tolerance: oxide is poorly absorbed and more likely to cause loose stools, while glycinate and threonate are gentler and better absorbed. Citrate is well absorbed but can have a laxative effect at higher doses. Green tea extract with high EGCG content is more concentrated, and decaffeinated versions eliminate any caffeine-related effects. Choose a magnesium form that fits your digestive tolerance and a green tea extract standardized to about 50% EGCG.
This pair is not commonly bundled in commercial stacks, but both individually appear in popular wellness formulas. Magnesium is a standard addition to sleep and muscle-recovery products, while green tea extract is often found in metabolism and antioxidant blends.
Yes, you can take them at the same time. I find that taking them together is convenient, and I don't expect any negative interaction. If you notice any digestive upset, try separating them by an hour or so.
Yes, it is safe to combine them daily. I have many clients who take this combination without issues. Just stick to recommended doses of each, especially keep EGCG under 800 mg per day.
You do not need to wait any specific time between them. I suggest taking green tea extract in the morning and magnesium in the evening to spread out your doses, but if you prefer to take them together, that is fine as well.
No, they don't compete for absorption. I see from the research that magnesium uses different transporter proteins than the ones that handle EGCG. In practice, this means you absorb both well regardless of timing.
Most people can take them together, but I advise caution if you have kidney issues, take thyroid medication, or are pregnant. Always check with your doctor if you have a medical condition or take prescription drugs.
I recommend taking both with food to avoid stomach upset, especially if you have a sensitive gut. Magnesium citrate can cause loose stools when taken on an empty stomach, and green tea extract may cause nausea. A small snack or meal is a good idea.
Reviewed by Caroline M. on January 22, 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.