Drug & supplement interaction

European Chestnut + Tofacitinib

Tofacitinib brand names: Xeljanz, Xeljanz XR.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between European Chestnut and Tofacitinib in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

European Chestnut and Tofacitinib

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Tofacitinib and European Chestnut in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for European Chestnut at all — not against Tofacitinib, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

European Chestnut safety at a glance

European Chestnut overall Use caution The nut is a common food, but concentrated leaf or bark extracts have not been well studied for safety.
Pregnancy Avoid There is not enough safety information, so medicinal use during pregnancy is best avoided.
Breastfeeding Avoid Safety during breastfeeding is unknown, so medicinal use is best avoided.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Tofacitinib and European Chestnut? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Tofacitinib’s Own FDA Label Lists

This is not an interaction — none of it involves European Chestnut. These are the most notable effects listed in the ADVERSE REACTIONS section of Tofacitinib’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 6 of them are worth acting on rather than waiting out — marked below.

  • Low blood sugar Worth acting on
  • Blood clots Worth acting on
  • A low white blood cell count Worth acting on
  • Liver problems Worth acting on
  • A higher chance of infection Worth acting on
  • An allergic reaction Worth acting on
  • Joint pain mentioned in 29.0% of FDA reports for Tofacitinib
  • Headache mentioned in 7.3% of FDA reports for Tofacitinib
  • Diarrhea
  • A skin rash

From the ADVERSE REACTIONS section of the FDA label for Tofacitinib. Read the label on DailyMed › Where a percentage is shown, it is the share of 185,980 voluntary FDA FAERS reports for Tofacitinib that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. European Chestnut’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no European Chestnut side to compare — that is a limit of the record, not a statement that European Chestnut has no side effects.

Everything else you take

See Every Supplement That Interacts With Tofacitinib

This page covers European Chestnut only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tofacitinib page lists 184 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Active Hexose Correlated Compound (ahcc) (moderate).

By severity: 3 major · 143 moderate · 38 minor.

From our pharmacist’s overview on the Tofacitinib page

“Supplements deserve genuine care alongside tofacitinib (Xeljanz, Xeljanz XR), a medicine that deliberately dials down the immune system to control conditions like rheumatoid arthritis and ulcerative colitis. Most of the interactions on this page run through the liver enzymes that clear the drug, meaning an herb can push its blood level…”

Reviewed by 2 · Jul 18, 2026

Open the Tofacitinib interaction page

How much people look this up

Where European Chestnut and Tofacitinib Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement European Chestnut
Steady interest

#1,418 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Tofacitinib
Top half

#866 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every European Chestnut reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The European Chestnut and Tofacitinib records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About European Chestnut

What is European Chestnut?

  • Coughs and respiratory irritation
  • Diarrhea and digestive upset
  • Sore throat
  • Wound and skin care
  • General antioxidant support

European Chestnut is a tree whose leaves and nuts have a long history of use for coughs, diarrhea, and skin care, mostly in traditional folk medicine. High-quality human studies are lacking, so its benefits remain unproven, and it should be used cautiously and discussed with a pharmacist or doctor.

Castanea sativa · Fagaceae · Leaves, nuts (seeds), bark, and flowers · Tea, liquid extract, capsules, honey, and topical preparations

An interaction check asks whether these two react with each other — it does not ask whether European Chestnut is a good idea for someone in your situation. Here is what our European Chestnut record says about it on its own.

European Chestnut: dosing

There is no standardized or well-established medicinal dose for European Chestnut. Products vary widely in strength and in which part of the plant they use.If you choose to use a chestnut product, follow the directions on the label and do not exceed the recommended amount.

From our European Chestnut monograph — the full record covers uses, side effects and every documented interaction.

Read the full European Chestnut monograph & all interactions
Medication

About Tofacitinib

What Is Tofacitinib Used For?

Brand names: Xeljanz, Xeljanz XR

  • Tofacitinib is used alone or with other medications to treat rheumatoid arthritis (condition in which the body attacks its own joints causing pain, swelling, and loss of function) in adults who are unable to take or did not respond to one or more tumor necrosis factor (TNF) inhibitor medication(s). It is also used to treat psoriatic arthritis (a condition that causes joint pain and swelling and scales on the skin) in adults who are unable to take or did not respond to or tolerate one or more TNF inhibitor medication(s). Tofacitinib is used to treat ulcerative colitis (a condition which causes swelling and sores in the lining of the colon [large intestine] and rectum) in adults who are unable to take or who did not respond to one or more TNF inhibitor medication(s). It is also used to treat polyarticular juvenile idiopathic arthritis (PJIA; a type of childhood arthritis that affects five or more joints during the first six months of the condition, causing pain, swelling, and loss of function) in children 2 years and older who are unable to take or who did not respond to one or more TNF inhibitor medication(s). Tofacitinib is in a class of medications called Janus kinase (JAK) inhibitors. It works by decreasing the activity of the immune system.

See full Tofacitinib drug information
Keep checking

Other Drugs & European Chestnut

Browse every other medication we’ve checked against European Chestnut — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked European Chestnut against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full European Chestnut list.

See the full European Chestnut interactions page
See every supplement checked against Tofacitinib, ranked by severity
Evidence & sources

European Chestnut References

The 1 references that drive our European Chestnut monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking European Chestnut and Tofacitinib Together: Common Questions

Is it safe to take European Chestnut with Tofacitinib?
We do not list a known interaction between European Chestnut and Tofacitinib. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Does Tofacitinib interact with any supplements?
Yes. Tofacitinib has documented interactions with 184 supplements in our database — European Chestnut is not one of them. The Tofacitinib interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

European Chestnut monograph Uses, safety profile, and every drug interaction in one place Tofacitinib drug information The full plain-English guide to this medication Tofacitinib supplement interactions Every supplement checked against Tofacitinib, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Tofacitinib and European Chestnut?

Our pharmacists answer your medication & supplement questions — free.

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.