Short answer

We found no documented interaction between Cordyceps and Green tea extract in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.

Cordyceps

What it is: A fungus that grows on moth caterpillars, used in traditional Chinese medicine for energy and immunity.

What the research says: Some studies looked at kidney function in transplant and diabetes patients, but reviews question the quality of the evidence. Most research is in the lab.

Cautions

• No major side effects have been reported.

Medicines to check

• Insulin and other blood-sugar-lowering medicines: cordyceps may lower blood sugar too
• Blood thinners such as warfarin: it may raise bleeding risk

In Holitro: Cordyceps (500 mg per capsule)

Source: Memorial Sloan Kettering Cancer Center, About Herbs: Cordyceps (updated February 2022)

Green tea extract

What it is: A concentrated extract of green tea leaves, rich in catechins such as EGCG. It contains caffeine.

What the research says: Catechins and caffeine may have a modest effect on weight, and it lowered LDL cholesterol a little. Cancer results are inconsistent.

Cautions

• Extracts can cause nausea, constipation, stomach discomfort and higher blood pressure.
• Liver injury has been reported, mainly with extract capsules; a gene variant found in 5 to 15% of Americans raises the risk.

Medicines to check

• Nadolol (a beta-blocker): green tea can lower its levels
• Atorvastatin (a statin) and raloxifene (an osteoporosis drug)

In Holitro: Green Tea Extract 500mg (500 mg per capsule)

Source: NIH National Center for Complementary and Integrative Health: Green Tea: Usefulness and Safety (updated February 2025)

Check with your doctor or pharmacist, especially if you take medication.

Check your stack — free

Educational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.