Quercetin and Ketamine: What to Monitor
Quercetin — Flavonoid antioxidant supplement
Verdict at Tovani Health
Compatible; high-dose supplementation has measurable CYP3A4 inhibition worth disclosing.
Quercetin and ketamine are compatible. Dietary quercetin (from onions, apples, berries) is well below any clinically relevant threshold. High-dose supplemental quercetin (500-1000 mg/day, popularized during COVID for zinc-ionophore protocols) has measurable CYP3A4 inhibition in vitro and in some human studies. The clinical magnitude of the ketamine effect at typical supplement doses is small but worth disclosing alongside other CYP3A4 considerations.
If you take Quercetin regularly and are considering at-home ketamine therapy, the combination is safe with monitoring or modest dose adjustment. This page covers the brief pharmacologic context and what we do at intake.
How Quercetin interacts with ketamine
Quercetin is a polyphenol flavonoid with antioxidant, anti-inflammatory, and mild CYP3A4 / P-glycoprotein modulating effects at supplemental doses. The COVID-era zinc-ionophore use revived widespread quercetin supplementation.
What we do at intake
Disclose dose, brand, and how long you have been taking it. Tell us about other CYP3A4 modulators you may take.
Bottom line
Quercetin and ketamine are compatible. Dietary quercetin (from onions, apples, berries) is well below any clinically relevant threshold. High-dose supplemental quercetin (500-1000 mg/day, popularized during COVID for zinc-ionophore protocols) has measurable CYP3A4 inhibition in vitro and in some human studies. The clinical magnitude of the ketamine effect at typical supplement doses is small but worth disclosing alongside other CYP3A4 considerations.
Ready to find out if at-home ketamine fits your situation?
We’ll note that you’re on Quercetin at intake. The eligibility check takes 5 minutes and gives you an honest answer about whether at-home ketamine fits your specific situation.
FL and NJ residents only. Benjamin Soffer, DO — Tovani Health.
Sources
The verdict and clinical guidance on this page are based on the following peer-reviewed literature and FDA prescribing information.
- Influence of quercetin on the pharmacokinetics of ranolazine in rats and in vitro models. Babu PR, Babu KN, Peter PL. Drug Development and Industrial Pharmacy. 2013. PMID: 22817837
- Ketamine: A Review of Clinical Pharmacokinetics and Pharmacodynamics in Anesthesia and Pain Therapy. Peltoniemi MA, Hagelberg NM, Olkkola KT, Saari TI. Clinical Pharmacokinetics. 2016. PMID: 27028535
Clinically reviewed
Reviewed by Benjamin Soffer, DO on May 19, 2026. Dr. Soffer is a board-certified physician (American Board of Internal Medicine) licensed in Florida and New Jersey, prescribing at-home ketamine therapy through Tovani Health.
This page is general information about how this medication interacts with at-home ketamine therapy at Tovani Health. It is not a substitute for medical advice from your prescribing physician about your specific situation. Always discuss medication changes with the doctor who prescribed them.