A complete safety, timing, and dosage guide for combining Green Tea Extract (EGCG) with Vitamin B9 (Folate, Folic Acid, Methylfolate) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can safely take vitamin B9 (folate) and green tea extract (EGCG) together — no significant interaction exists.
Vitamin B9 (folate) and green tea extract (EGCG) together are a safe, neutral combination. Neither supplement interferes with the other's absorption or activity, so you can take them in the same daily routine without concern. This pairing requires no special timing or dosing adjustments.
Folate (vitamin B9) is a water-soluble B vitamin absorbed in the proximal small intestine via the reduced folate carrier and the proton-coupled folate transporter, while EGCG from green tea extract is a polyphenol absorbed through different mechanisms and rapidly metabolized by glucuronidation and sulfation. They do not share transport proteins or metabolic enzymes, so they do not compete for absorption or interfere with each other's breakdown. One theoretical concern is that EGCG can inhibit dihydrofolate reductase (DHFR) in test-tube studies, and DHFR is needed to convert folic acid into active 5-MTHF; however, this effect has not been shown to be clinically significant at usual supplement doses. If you are taking methylfolate (5-MTHF), which is already in its active form, this theoretical issue is bypassed entirely. Overall, the two act independently in the body, making the combination safe.
Take vitamin B9 with a meal and a glass of water, and green tea extract at a separate time of day if you prefer, though spacing is not necessary. If you are using folic acid, you can take it any time of day; taking it with food improves tolerance. Green tea extract is best absorbed on an empty stomach, but if it causes nausea, take it with a light snack. If you miss a dose of either, simply take it at your next regular time and never double up on the next dose.
The theoretical DHFR inhibition by EGCG applies mainly to folic acid, not to methylfolate or natural food folate. If you take folic acid and are still concerned, you can switch to methylfolate or another active form to completely avoid any potential interference. Green tea extract standardization matters more for EGCG content than for this interaction; caffeine-free and decaffeinated versions behave the same with respect to folate.
Vitamin B9 is commonly included in prenatal and cardiovascular support formulas, while green tea extract is popular in weight-management and antioxidant blends. This particular pair shows up more often when a person adds an EGCG supplement to an existing multivitamin or prenatal containing folate rather than as a purpose-built combination.
Yes, you can take them together in one sitting because they use different absorption and metabolic pathways. I typically suggest taking B9 with a meal and green tea extract with or without food, whichever you tolerate best. No spacing is required.
Yes, it is safe to combine them daily at recommended doses. I recommend staying within reasonable doses — for example, up to 400–800 mcg of folate for most adults and 300–500 mg of green tea extract standardized for EGCG. As with any supplement, check with your doctor if you have underlying health conditions.
You do not need to wait at all. If you want to be cautious, you can take them 30–60 minutes apart, but this is optional and not based on any demonstrated interaction.
No, they do not compete for absorption. Folate is absorbed via specific transporters in the upper intestine, while EGCG is absorbed through different mechanisms and is not transported by the same carriers. There is no meaningful competition.
I advise most healthy adults that they can take the pair safely. The main exceptions are people with liver issues, those on blood thinners, or women who are pregnant and sensitive to caffeine — in those cases, I recommend checking with a healthcare provider before using a concentrated green tea extract alongside any B9 supplement.
I recommend taking vitamin B9 with food to reduce stomach upset, and green tea extract on an empty stomach for best absorption if it doesn’t bother you. If green tea extract causes nausea, take it with a light meal. The two do not need to be separated.
Reviewed by Caroline M. on April 9, 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.