Drug & supplement interaction

Hu Zhang + Liotrix

Liotrix brand names: Euthroid 3, Euthroid 1/2, Euthroid 1.

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

We found no known interaction between Hu Zhang and Liotrix 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. Additionally, although there is no interaction, the label for Liotrix states a food rule worth keeping to.

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Interaction report

Hu Zhang and Liotrix

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 Liotrix and Hu Zhang 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.

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.

Hu Zhang safety at a glance

Hu Zhang overall Use caution Generally used in traditional medicine, but human safety data for supplements are limited and its emodin content may cause digestive upset.
Pregnancy Avoid Not enough safety data and some compounds may affect the uterus or bowel, so it is best avoided.
Breastfeeding Avoid There is not enough safety information, so avoid use while breastfeeding.

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

Still wondering about combining Liotrix and Hu Zhang? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Liotrix

Interactions in our licensed database are recorded against drug classes, not just single drug names. Liotrix is filed under 2 classifications — thyroid hormone, oral drugs. Hu Zhang has documented interactions with 7 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), cytochrome p450 1a2 (cyp1a2) substrates (moderate) and cytochrome p450 2c19 (cyp2c19) substrates (moderate) — and none of Liotrix’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Hu Zhang Does Interact With Other Medications

Hu Zhang has 826 moderate known drug interactions in our database — Liotrix isn’t one of them. If you take anything else, check it against the full list below.

Moderate 826 No known interaction 2,004 (incl. Liotrix)
Taking anything else?

Check Another of Your Medications Against Hu Zhang

Covers the 2,830 medications we’ve checked against Hu Zhang. Pick one to open its full report.

What to actually watch for

What Liotrix’s Own FDA Label Lists

This is not an interaction — none of it involves Hu Zhang. These are the most notable effects listed in the ADVERSE REACTIONS section of Liotrix’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. 10 of them are worth acting on rather than waiting out — marked below.

  • A change in thyroid levels Worth acting on
  • Bone thinning Worth acting on
  • Muscle weakness Worth acting on
  • A heart attack Worth acting on
  • Heart failure Worth acting on
  • Wheezing Worth acting on
  • Seizures Worth acting on
  • Chest pain Worth acting on
  • Shortness of breath Worth acting on
  • A severe allergic reaction Worth acting on

Showing the 10 most notable of 32 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Liotrix. Read the label on DailyMed › Hu Zhang’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Hu Zhang side to compare — that is a limit of the record, not a statement that Hu Zhang has no side effects.

How to take them

Some Liotrix Products Have a Food Rule — Hu Zhang Should Not Break It

At least one FDA label for a product containing Liotrix says to take it on an empty stomach. Most supplements — Hu Zhang included — are taken with a meal, so the easy mistake is swallowing both together at breakfast. Where that rule applies, keep Liotrix on its own and move Hu Zhang to a meal later in the day.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Liotrix products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What Liotrix Is Prescribed For, and What Hu Zhang Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Liotrix is a prescription medicine with approved uses on its FDA label. Hu Zhang is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Hu Zhang has been studied for:

  • Constipation studied, not established Hu Zhang has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Hu Zhang for constipation

    Although there has been interest in using oral hu zhang for constipation, there is insufficient reliable information about the clinical effects of hu zhang for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Liotrix on your own; if you are taking Hu Zhang for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Liotrix

This page covers Hu Zhang only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Liotrix page lists 38 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Tiratricol (major), Acetyl-l-carnitine (moderate), Alpha-lipoic Acid (moderate) and Ascophyllum Nodosum (moderate).

By severity: 2 major · 26 moderate · 10 minor.

From our pharmacist’s overview on the Liotrix page

“Liotrix (Euthroid) combines both thyroid hormones, and since steady hormone levels are the entire point of treatment, this list deserves a slow, serious read. Most entries fall into two camps: twenty-one ingredients act on the hormone itself, some boosting it and others blunting it, while another seventeen change how well the dose is a…”

Reviewed by 2 · Jul 18, 2026

Open the Liotrix interaction page

One more smart check

Taking Hu Zhang as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1,014 real supplement products containing Hu Zhang, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Hu Zhang. Even though Hu Zhang itself has no known interaction with Liotrix, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Hu Zhang and Liotrix 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 Hu Zhang
Top 25%

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

29 days ago today
Medication Liotrix
Steady interest

#1,954 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 Hu Zhang reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Hu Zhang and Liotrix records this page draws on were last updated June 22, 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 Hu Zhang

What is Hu Zhang?

  • Source of resveratrol
  • Heart and circulation support
  • Inflammation
  • Liver and digestive complaints (traditional)
  • Cough and respiratory symptoms (traditional)
  • Skin and joint conditions (traditional topical use)

Hu Zhang (Japanese knotweed root) is a traditional Chinese herb that is one of the richest natural sources of resveratrol and emodin. Some lab and early human research looks interesting for inflammation and heart health, but high-quality evidence in people is limited. Talk to your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.

Reynoutria japonica · Polygonaceae · Root and rhizome · Capsules, tablets, powder, tincture, dried root for tea (decoction), standardized resveratrol extracts

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

Hu Zhang: dosing

There is no well-established standard dose of Hu Zhang. Products vary widely in strength, and some are standardized to a certain percentage of resveratrol while others are not.Because doses differ so much between products, the safest approach is to follow the directions on the label of the specific product you have.

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

Read the full Hu Zhang monograph & all interactions
Medication

About Liotrix

What Is Liotrix Used For?

Brand names: Euthroid 3, Euthroid 1/2, Euthroid 1

  • Liotrix is used to treat hypothyroidism (a condition that results when the thyroid gland does not produce enough thyroid hormone). Symptoms of hypothyroidism include lack of energy, depression, constipation, weight gain, hair loss, dry skin, dry coarse hair, muscle cramps, decreased concentration, aches and pains, swelling of the legs, and increased sensitivity to cold. When taken correctly, liotrix can reverse these symptoms. Liotrix is also used to treat goiter (enlarged thyroid gland). This medication is also used to test for hyperthyroidism (a condition where the thyroid gland produces too much thyroid hormone). Liotrix is in a class of medications called thyroid agents. It works by supplying the thyroid hormones normally produced by the body.

See full Liotrix drug information
Keep checking

Other Drugs & Hu Zhang

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

0Major
826Moderate
0Minor
2,003No known interaction
826 Moderate 2,003 No interaction
Moderate

826 interactions

Showing 60 of 826 moderate interactions — see all 826 on the Hu Zhang page.

No interaction 2,003 drugs checked — show the list

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

Showing the 60 most looked-up of 2,003 medications checked with no known interaction — see the full Hu Zhang list.

See the full Hu Zhang interactions page
See every supplement checked against Liotrix, ranked by severity
Evidence & sources

Hu Zhang References

The 19 references that drive our Hu Zhang 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. Pace-Asciak CR, Rounova O, Hahn SE, et al. Wines and grape juices as modulators of platelet aggregation in healthy human subjects. Clin Chim Acta 1996;246:163-82. PubMed
  2. Bertelli AA, Giovannini L, Bernini W, et al. Antiplatelet activity of cis-resveratrol. Drugs Exp Clin Res 1996;22:61-3.
  3. Pace-Asciak CR, Hahn S, Diamandis EP, et al. The red wine phenolics trans-resveratrol and quercetin block human platelet aggregation and eicosanoid synthesis: implications for protection against coronary heart disease. Clin Chim Acta 1995;235:207-19.
  4. Bertelli A, Bertelli AA, Gozzini A, Giovannini L. Plasma and tissue resveratrol concentrations and pharmacological activity. Drugs Exp Clin Res 1998;24:133-8.
  5. Bertelli AA, Giovannini L, Giannessi D, et al. Antiplatelet activity of synthetic and natural resveratrol in red wine. Int J Tissue React 1995;17:1-3.
  6. Piver B, Berthou F, Dreano Y, Lucas D. Inhibition of CYP3A, CYP1A and CYP2E1 activities by resveratrol and other non volatile red wine components. Toxicol Lett 2001;125:83-91. PubMed
  7. Matsuda H, Shimoda H, Morikawa T, Yoshikawa M. Phytoestrogens from the roots of Polygonum cuspidatum (Polygonaceae): structure-requirement of hydroxyanthraquinones for estrogenic activity. Bioorg Med Chem Lett 2001;11:1839-42. PubMed
  8. Zhang CZ, Wang SX, Zhang Y, et al. In vitro estrogenic activities of Chinese medicinal plants traditionally used for the management of menopausal symptoms. J Ethnopharmacol 2005;98:295-300. PubMed
  9. Chang, T. K., Chen, J., and Lee, W. B. Differential inhibition and inactivation of human CYP1 enzymes by trans-resveratrol: evidence for mechanism-based inactivation of CYP1A2. J.Pharmacol.Exp.Ther. 2001;299(3):874-882.
  10. Dobrydneva, Y., Williams, R. L., and Blackmore, P. F. trans-Resveratrol inhibits calcium influx in thrombin-stimulated human platelets. Br.J.Pharmacol. 1999;128(1):149-157.
  11. Kirk, R. I., Deitch, J. A., Wu, J. M., and Lerea, K. M. Resveratrol decreases early signaling events in washed platelets but has little effect on platalet in whole food. Blood Cells Mol.Dis. 2000;26(2):144-150.
  12. Zbikowska, H. M. and Olas, B. Antioxidants with carcinostatic activity (resveratrol, vitamin E and selenium) in modulation of blood platelet adhesion. J Physiol Pharmacol. 2000;51(3):513-520.
  13. Olas, B., Wachowicz, B., Saluk-Juszczak, J., and Zielinski, T. Effect of resveratrol, a natural polyphenolic compound, on platelet activation induced by endotoxin or thrombin. Thromb.Res 8-15-2002;107(3-4):141-145. PubMed
  14. Yu, C., Shin, Y. G., Kosmeder, J. W., Pezzuto, J. M., and van Breemen, R. B. Liquid chromatography/tandem mass spectrometric determination of inhibition of human cytochrome P450 isozymes by resveratrol and resveratrol-3-sulfate. Rapid Commun.Mass Spectro PubMed
  15. Ma, Z. H. and Ma, Q. Y. Resveratrol: a medical drug for acute pancreatitis. World J Gastroenterol. 6-7-2005;11(21):3171-3174. PubMed

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 Hu Zhang and Liotrix Together: Common Questions

Is it safe to take Hu Zhang with Liotrix?
We do not list a known interaction between Hu Zhang and Liotrix. 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.
Should I take Hu Zhang and Liotrix at the same time of day?
At least one FDA label for a product containing Liotrix says to take it on an empty stomach, and supplements are usually taken with a meal — so taking them together at breakfast is the easy mistake. Where that applies, keep Liotrix on its own and move Hu Zhang to a meal later in the day. Food instructions belong to the product rather than the ingredient, so check the directions on your own box. This is about absorption, not an interaction.
Are Hu Zhang and Liotrix used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Hu Zhang in each. That is a conversation for your prescriber, especially if Liotrix is being adjusted to a target.
How was the Hu Zhang and Liotrix combination checked?
Interactions in our licensed database are recorded against drug classes. Liotrix is filed under 2 classifications, and Hu Zhang has documented interactions with 7 drug classes — none of Liotrix's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Hu Zhang interact with any other medications?
Yes. Hu Zhang has 826 documented drug interactions in our database — Liotrix is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Liotrix interact with any supplements?
Yes. Liotrix has documented interactions with 38 supplements in our database — Hu Zhang is not one of them. The Liotrix 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

Hu Zhang monograph Uses, safety profile, and every drug interaction in one place Liotrix drug information The full plain-English guide to this medication Liotrix supplement interactions Every supplement checked against Liotrix, 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 19 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Liotrix and Hu Zhang?

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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.