Th2 Modulator Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Th2 Modulator against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
Th2 Modulator is a dietary supplement by Pure Encapsulations with 4 active ingredients. Its ingredients are commonly taken for seasonal allergies, antioxidant support, heart and blood pressure health.Based on those ingredients, 1,295 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Quercetin, N-Acetyl-L-Cysteine, Astragalus Root Extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Th2 Modulator by Pure Encapsulations
Ask about any prescription or over-the-counter medication and we check it for interactions with Th2 Modulator by Pure Encapsulations — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Th2 Modulator by Pure Encapsulations
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
Th2 Modulator contains four active ingredients. Quercetin is a plant flavonoid; N-acetyl cysteine (NAC) is an amino acid derivative that supports cellular antioxidant defense; astragalus root extract is a traditional herbal component; and perilla seed extract is derived from perilla plant seeds.
The product also contains cellulose and water as inactive ingredients.
Does it work?
Moderate evidence
The evidence on effectiveness for this product is limited. Quercetin shows possibly ineffective rating for athletic performance; the data for age-related cognitive decline, hay fever, Alzheimer's disease, asthma, and atherosclerosis is insufficient to rate.
N-acetyl cysteine is effective for acetaminophen poisoning and certain respiratory uses, and possibly effective for bronchitis. For astragalus and perilla — the ratings are insufficient to establish effectiveness for the conditions listed in our data (hay fever, dizziness, asthma, and others).
The evidence we hold does not establish what this combination is designed to do.
How safe is it?
Well-documented data
Quercetin is generally well tolerated at typical doses, though high doses and long-term safety haven't been well studied. Oral quercetin may cause headache and tingling in the extremities.
N-acetyl cysteine is generally well tolerated at routine doses; side effects mainly occur at single doses above 9 grams or daily regimens above 30 grams. Common oral side effects include diarrhea, dry mouth, heartburn, nausea, and vomiting.
Astragalus is generally well tolerated short-term, though human safety data is limited; rare reports include dizziness and palpitations. Perilla seems well tolerated as a food; anaphylaxis (a severe allergic reaction) is rare but has been reported with perilla seeds.
For pregnancy: quercetin, astragalus, and perilla all lack enough safety data and should be avoided during pregnancy and breastfeeding. N-acetyl cysteine safety during pregnancy has not been well studied — talk to your doctor.
For breastfeeding, N-acetyl cysteine lacks enough reliable safety information; caution is advised.
Meds to double-check
Major interaction found
Before taking Th2 Modulator, double-check if you use nitroglycerin (Major interaction with N-acetyl cysteine, causing severe blood pressure drop and headaches). Then check for Moderate interactions: any blood pressure medications, blood thinners like warfarin, cholesterol drugs (statins), diabetes medications, immune-suppressing drugs, lithium, quinolone antibiotics, or chemotherapy agents.
If you use any of these, talk to your pharmacist or doctor before starting.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Major medication interactions have been identified, and safety information is well characterized.
If you take nitroglycerin, blood thinners, blood pressure drugs, statins, diabetes medications, or immunosuppressants, check with your pharmacist before starting this product — the interactions are real and some are serious. Even if you don't take those, run your full medication list through the checker on this page.
Pregnant or breastfeeding? Avoid this product and talk to your doctor.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 4 of 4 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Dec 14, 2023.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Th2 Modulator, straight from the product label.
| Brand | Pure Encapsulations |
|---|---|
| Barcode (UPC) | 766298022031 |
| Net contents | 120 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Dec 14, 2023 |
| DSLD ID | 299740 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Th2 Modulator by Pure Encapsulations, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Quercetin | 250 mg | -- |
| N-Acetyl-L-Cysteine | 300 mg | -- |
| Astragalus Root Extract | 160 mg | -- |
| Perilla Seed Extract | 150 mg | -- |
Other ingredients: Cellulose, Water, Cellulose
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Storage
Store in a cool, dry place.
Suggested/Recommended/Usage/Directions
Recommendations: As a dietary supplement, take 2 capsules, 1-2 times daily, between meals or as directed by a health professional.
Precautions
Warning: If you are pregnant or lactating, have any health condition or are taking any medication, consult your health professional before use.
Keep out of the reach of children.
Use only if safety seal is intact.
General Statements
Contents may not fill package in order to accommodate required labeling. Please rely on stated quantity. Scan to learn about our hypoallergenic supplements
Seals/Symbols
GFCO.org (Gluten-Free Certification Organization)
Formulation
Certified Gluten-Free by the Gluten-Free Certified Organization www.gluten.org Gluten-Free, Non-GMO & Hypoallergenic
PureResponse Formula: Helps to modulate the Th2 immune response and maintain Th1/Th2 balance at the cellular level. Gluten-Free, Non-GMO & Hypoallergenic
FDA Statement of Identity
Dietary Supplement
FDA Disclaimer Statement
This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Th2 Modulator by Pure Encapsulations label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Th2 Modulator by Pure Encapsulations
These are the 4 active ingredients this product is made of. Select any to open its full monograph.
Serving size2 Capsule(s) Dosage formCapsule Servings per container60 Amounts shown are per serving.
Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.
Quercetin
Interacts with1,169 drugs
Quercetin is a plant flavonoid with antioxidant and anti-inflammatory properties found in many common foods and sold as a supplement. While early rese...
Quercetin monograph & interactionsN-Acetyl-L-Cysteine
Interacts with294 drugs
N-acetyl cysteine (NAC) is a supplement form of the amino acid cysteine and a building block for the antioxidant glutathione. It has well-established...
N-Acetyl-L-Cysteine monograph & interactionsAstragalus Root Extract
Interacts with208 drugs
Astragalus is a root used for centuries in traditional Chinese medicine, mainly to support the immune system and help the body cope with stress. While...
Astragalus Root Extract monograph & interactionsPerilla Seed Extract
No knowninteractions
Perilla is an Asian mint-family plant used in cooking and traditional medicine, mainly for allergy, breathing, and digestive complaints. Most human ev...
Perilla Seed Extract monograph & interactionsOther (inactive) ingredients: Cellulose, Water, Cellulose. These complete the product’s ingredient list but are not active constituents.
Th2 Modulator by Pure Encapsulations Drug Interactions
HelloPharmacist Interaction Report
Th2 Modulator by Pure Encapsulations contains four ingredients, and three of them have documented interactions with medications.
The most serious is N-acetyl cysteine paired with nitroglycerin (a Major severity interaction) — the combination can cause severe low blood pressure (hypotension) and severe headaches, particularly with intravenous or skin-patch forms of nitroglycerin.
Read the full breakdown — every affected drug type, severity by severity
Quercetin interacts with eight medication types, all Moderate severity. The main ones to watch for are blood thinners (anticoagulants) like warfarin — quercetin may increase bleeding risk — and blood pressure drugs (antihypertensives) like losartan, which may have their effects amplified.
It also affects statins (cholesterol drugs), some antibiotics (quinolones), immunosuppressants like cyclosporine, and certain cancer and inflammatory drugs.
N-acetyl cysteine carries Moderate interactions with blood pressure medications, blood thinners, and a few other drugs including the antimalarial chloroquine and activated charcoal (used in overdose treatment). Astragalus root extract has Moderate interactions with immune-suppressing drugs, lithium, cyclophosphamide (a chemotherapy drug), and diabetes medications — the diabetes concern is that astragalus may lower blood sugar further.
Perilla seed extract was not checked for interactions — we hold no interaction data for it. Altogether, these interactions span 1,273 individual medications.
Use the medication checker below with your exact prescriptions before you start this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Th2 Modulator?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Th2 Modulator interact with 1,295 drugs. Click any drug to see the details.
3 of the 4 ingredients in Th2 Modulator interact with drugs. Each result below shows which ingredient is responsible. Quercetin N-Acetyl-L-Cysteine Astragalus Root Extract
NitroglycerinGonitro, Nitro Time, Nitro-Bid, Nitrocine Timecaps, Nitrogard, Nitrogard SR +7 more
How Nitroglycerin interacts with Th2 Modulator — through 1 ingredient. Tap an ingredient for the detail:
N-acetyl-l-cysteineNitroglycerin Major
Interaction Summary
N-acetyl cysteine can increase the risk for hypotension and headaches when taken with intravenous or transdermal nitroglycerin.
Read the full N-acetyl-l-cysteine + Nitroglycerin interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Th2 Modulator with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.
Quercetin
Antidiabetes Drugs
Theoretically, concomitant use of quercetin and antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research suggests that a combination of quercetin, myricetin, and chlorogenic acid reduce levels of fasting glucose in patients with type 2 diabetes, including those already taking antidiabetes agents. The effect of quercetin alone is unknown.
Antihypertensive Drugs
Theoretically, taking quercetin with antihypertensive drugs might increase the risk of hypotension.
Quercetin can modestly decrease blood pressure in people with mild hypertension. Theoretically, it might have additive blood pressure lowering effects when used with antihypertensive drugs.
Cyclosporine (Neoral, Sandimmune)
Theoretically, concomitant use might increase the levels and adverse effects of cyclosporine.
A small study in healthy volunteers shows that pretreatment with quercetin increases plasma levels and prolongs the half-life of a single dose of cyclosporine, possibly due to inhibition of p-glycoprotein or cytochrome P450 3A4 (CYP3A4), which metabolizes cyclosporin.
Cytochrome P450 2C8 (Cyp2C8) Substrates
Theoretically, concomitant use might increase the levels and adverse effects of CYP2C8 substrates.
In vitro research shows that quercetin inhibits CYP2C8. Inhibition of paclitaxel (Taxol) metabolism via CYP2C8 has been reported in vitro. However, a small study in humans found no effect of quercetin on rosiglitazone (Avandia), which is also a CYP2C8 substrate.
Cytochrome P450 2C9 (Cyp2C9) Substrates
Theoretically, concomitant use might increase the levels and adverse effects of CYP2C9 substrates.
A small clinical study in healthy volunteers shows that taking quercetin 500 mg twice daily for 10 days prior to taking diclofenac, a CYP2C9 substrate, increases diclofenac plasma levels by 75% and prolongs the half-life by 32.5%. Animal research also shows that pretreatment with quercetin increases plasma levels and prolongs the half-life of losartan (Cozaar), a substrate of CYP2C9. Furthermore, laboratory research shows that quercetin inhibits CYP2C9.
Cytochrome P450 2D6 (Cyp2D6) Substrates
Theoretically, concomitant use might increase the levels and adverse effects of CYP2D6 substrates.
In vitro research show that quercetin inhibits CYP2D6. This effect has not been reported in humans.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Theoretically, concomitant use might alter the effects and adverse effects of CYP3A4 substrates.
A small clinical study in healthy volunteers shows that pretreatment with quercetin increases plasma levels and prolongs the half-life of a single dose of cyclosporine (Neoral, Sandimmune), a substrate of CYP3A4. Animal research also shows that pretreatment with quercetin increases plasma levels and prolongs the half-life of losartan (Cozaar) and quetiapine (Seroquel), substrates of CYP3A4. Other laboratory research also shows that quercetin inhibits CYP3A4. However, one clinical study shows that quercetin can increase the metabolism of midazolam, a substrate of CYP3A4, and decrease serum concentrations of midazolam by about 24% in some healthy individuals, suggesting possible induction of CYP3A4.
Diclofenac (Voltaren, Others)
Theoretically, concomitant use might increase the levels and adverse effects of diclofenac.
A small clinical study in healthy volunteers shows that taking quercetin 500 mg twice daily for 10 days prior to taking diclofenac increases diclofenac plasma levels by 75% and prolongs the half-life by 32.5%. This is thought to be due to inhibition of CYP2C9 by quercetin.
Losartan (Cozaar)
Theoretically, concomitant use might increase the effects and adverse effects of losartan and decrease the effects of its active metabolite.
Animal research shows that pretreatment with quercetin increases plasma levels and prolongs the half-life of losartan (Cozaar) while decreasing plasma levels of losartan's active metabolite. This metabolite, which is around 10-fold more potent than losartan, is the result of cytochrome P450 (CYP) 2C9- and CYP3A4-mediated transformation of losartan. Additionally, in vitro research shows that quercetin may inhibit P-glycoprotein-mediated efflux of losartan from the intestines, resulting in increased absorption of losartan. These results suggest that concomitant use of quercetin and losartan might increase systemic exposure to losartan while also decreasing plasma concentrations of losartan's active and more potent metabolite.
Midazolam (Versed)
Theoretically, concomitant use might decrease the levels and effects of midazolam.
A small clinical study in healthy volunteers shows that quercetin can increase the metabolism of midazolam, with a decrease in AUC of about 24%.
Mitoxantrone
Theoretically, quercetin might increase the effects and adverse effects of mitoxantrone.
In vitro research shows that quercetin increases the intracellular accumulation and cytotoxicity of mitoxantrone, possibly through inhibition of breast cancer resistance protein (BCRP), of which mitoxantrone is a substrate. So far, this interaction has not been reported in humans.
Organic Anion Transporter 1 (Oat1) Substrates
Theoretically, concomitant use might increase the effects and adverse effects of OAT1 substrates.
In vitro research shows that quercetin is a strong non-competitive inhibitor of OAT1, with half-maximal inhibitory concentration (IC50) values less than 10 mcM. So far, this interaction has not been reported in humans.
Organic Anion Transporter 3 (Oat3) Substrates
Theoretically, concomitant use might increase the effects and adverse effects of OAT3 substrates.
In vitro research shows that quercetin is a strong non-competitive inhibitor of OAT3, with half-maximal inhibitory concentration (IC50) values as low as 0.75 mcM. So far, this interaction has not been reported in humans.
Organic Anion-Transporting Polypeptide Substrates (Oatp)
Theoretically, concomitant use might increase the effects and adverse effects of OATP substrates.
In vitro evidence shows that quercetin can inhibit organic anion-transporting peptide (OATP) 1B1-mediated uptake of estrone-3-sulfate and pravastatin. Furthermore, clinical research in healthy males shows that intake of quercetin along with pravastatin increases the AUC of pravastatin by 24%, prolongs its half-life by 14%, and decreases its apparent clearance by 18%, suggesting that quercetin modestly inhibits the uptake of pravastatin in hepatic cells.
P-Glycoprotein Substrates
Theoretically, concomitant use might alter the effects and adverse effects of P-glycoprotein substrates.
There is preliminary evidence that quercetin inhibits the gastrointestinal P-glycoprotein efflux pump, which might increase the bioavailability and serum levels of drugs transported by the pump. A small study in healthy volunteers reported that pretreatment with quercetin increased bioavailability and plasma levels after a single dose of cyclosporine (Neoral, Sandimmune). Also, two small studies have shown that quercetin might decrease the absorption of talinolol, a substrate transported by the gastrointestinal P-glycoprotein efflux pump. However, in another small study, several days of quercetin treatment did not significantly affect the pharmacokinetics of saquinavir (Invirase). The reason for these discrepancies is not entirely clear. Until more is known, use quercetin cautiously in combination with P-glycoprotein substrates.
Pravastatin (Pravachol)
Theoretically, concomitant use might increase the effects and adverse effects of pravastatin.
In vitro evidence shows that quercetin can inhibit OATP 1B1-mediated uptake of pravastatin. Also, preliminary clinical research in healthy males shows that intake of quercetin along with pravastatin increases the maximum concentration of pravastatin by 24%, prolongs its half-life by 14%, and decreases its apparent clearance by 18%, suggesting that quercetin modestly inhibits the uptake of pravastatin in hepatic cells.
Prazosin (Minipress)
Theoretically, quercetin might increase the effects and adverse effects of prazosin.
In vitro research shows that quercetin inhibits the transcellular efflux of prazosin, possibly through inhibition of breast cancer resistance protein (BCRP), of which prazosin is a substrate. BCRP is an ATP-binding cassette efflux transporter in the intestines, kidneys, and liver. So far, this interaction has not been reported in humans.
Quetiapine (Seroquel)
Theoretically, concomitant use might increase the effects and adverse effects of quetiapine.
Animal research shows that pretreatment with quercetin can increase plasma levels of quetiapine and prolong its clearance, possibly due to inhibition of cytochrome P450 3A4 (CYP3A4) by quercetin. Additionally, the brain-to-plasma ratio of quetiapine concentrations increased, possibly due to inhibition of P-glycoprotein at the blood-brain barrier. This interaction has not been reported in humans.
Quinolone Antibiotics
Theoretically, concomitant use might inhibit the effects of quinolone antibiotics.
In vitro, quercetin binds to the DNA gyrase site on bacteria, which may interfere with the activity of quinolone antibiotics.
Sulfasalazine (Azulfidine)
Theoretically, quercetin might increase the effects and adverse effects of sulfasalazine.
Animal research shows that quercetin increases the maximum serum concentration (Cmax) and area under the curve (AUC) of sulfasalazine, possibly through inhibition of breast cancer resistance protein (BCRP), of which sulfasalazine is a substrate. So far, this interaction has not been reported in humans.
Warfarin (Coumadin)
Theoretically, quercetin may increase the risk of bleeding if used with warfarin.
Animal and in vitro studies show that quercetin might increase serum levels of warfarin. Quercetin and warfarin have the same human serum albumin (HSA) binding site, and in vitro research shows that quercetin has stronger affinity for the HSA binding site and can theoretically displace warfarin, causing higher serum levels of warfarin. Animal research shows that taking quercetin for 2 weeks before initiating warfarin increases the maximum serum level of warfarin by 30%, the half-life by 10%, and the overall exposure by 63% when compared with control. Concomitant administration of quercetin and warfarin, without quercetin pre-treatment, also increased these measures, but to a lesser degree. Researchers theorize that inhibition of CYP3A4 by quercetin may explain these effects. So far, this interaction has not been reported in humans.
N-Acetyl-L-Cysteine
Nitroglycerin
N-acetyl cysteine can increase the risk for hypotension and headaches when taken with intravenous or transdermal nitroglycerin.
Clinical research shows that concomitant administration of N-acetyl cysteine and intravenous or transdermal nitroglycerin can cause severe hypotension and intolerable headaches. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Activated Charcoal
N-acetyl cysteine might reduce the effects of activated charcoal, while activated charcoal might reduce the absorption of N-acetyl cysteine.
N-acetyl cysteine appears to reduce the capacity of activated charcoal to adsorb acetaminophen and salicylic acid. Conversely, although clinical research suggests that although activated charcoal can reduce the absorption of N-acetyl cysteine by up to 40%, it does not seem to reduce its clinical effects. Other clinical evidence suggests that activated charcoal does not affect the absorption of N-acetyl cysteine.
Anticoagulant/Antiplatelet Drugs
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Clinical research suggests that intravenous N-acetyl cysteine decreases prothrombin time, prolongs coagulation time, decreases platelet aggregation, and increases blood loss in surgical patients. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Antihypertensive Drugs
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Animal research suggests that N-acetyl cysteine potentiates the hypotensive effects of the angiotensin-converting enzyme inhibitors (ACEIs) captopril and enalaprilat. Theoretically, combining N-acetyl cysteine with other antihypertensive drugs might increase the risk of hypotension.
Chloroquine (Aralen)
Theoretically, N-acetyl cysteine might interfere with the antimalarial effects of chloroquine.
Animal research suggests that N-acetyl cysteine might reduce the antimalarial effects of chloroquine by increasing cellular levels of glutathione.
Astragalus Root Extract
Antidiabetes Drugs
Theoretically, taking astragalus with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research in humans shows that astragalus might have hypoglycemic effects. Theoretically, taking astragalus, especially in combination with other hypoglycemic agents, might increase the risk of hypoglycemia.
Cyclophosphamide
Theoretically, astragalus might interfere with cyclophosphamide therapy.
Evidence regarding the effect of astragalus on immunosuppression caused by cyclophosphamide is conflicting. Some animal research suggests that astragalus reverses cyclophosphamide-induced immunosuppression. However, other animal research shows no effect.
Immunosuppressants
Theoretically, astragalus might interfere with immunosuppressive therapy.
Astragalus seems to stimulate immune function. Theoretically, taking astragalus might decrease the effects of immunosuppressive therapy.
Lithium
Theoretically, astragalus might increase levels and adverse effects of lithium.
Animal research suggests that astragalus has diuretic properties. Theoretically, due to this diuretic effect, astragalus might reduce excretion and increase levels of lithium.
Brand information
Manufacturer and brand details for Th2 Modulator, from the product label.
Pure Encapsulations
See all Pure Encapsulations products- Name
- Pure Encapsulations
- Street Address
- 490 Boston Post Road
- City
- Sudbury
- State
- MA
- Phone Number
- 1-800-753-2277
- Web Address
- www.PureEncapsulations.com
Th2 Modulator by Pure Encapsulations: Common Questions
Does Th2 Modulator by Pure Encapsulations interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What's actually in this formula?
Will quercetin in this product interact with my statin or blood thinner?
Is N-acetyl cysteine safe if I take blood pressure medication?
Can I take this while pregnant or breastfeeding?
Does astragalus in here interact with diabetes medication?
Are there any common side effects from this product?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind Th2 Modulator’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Quercetin
Interacts with 1,169 drugsQuercetin is a plant flavonoid with antioxidant and anti-inflammatory properties found in many common foods and sold as a supplement. While early research is interesting for allergies, blood...
Read the full Quercetin monograph → Herb & supplement monographN-acetyl Cysteine (nac)
Interacts with 294 drugsN-acetyl cysteine (NAC) is a supplement form of the amino acid cysteine and a building block for the antioxidant glutathione. It has well-established prescription uses for acetaminophen over...
Read the full N-acetyl Cysteine (nac) monograph → Herb & supplement monographAstragalus
Interacts with 208 drugsAstragalus is a root used for centuries in traditional Chinese medicine, mainly to support the immune system and help the body cope with stress. While early studies are interesting, strong h...
Read the full Astragalus monograph → Herb & supplement monographPerilla
Perilla is an Asian mint-family plant used in cooking and traditional medicine, mainly for allergy, breathing, and digestive complaints. Most human evidence is limited or preliminary, so it...
Read the full Perilla monograph →Sources & How We Checked
Th2 Modulator's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 129 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Quercetin 26 references
- Shoskes DA, Zeitlin SI, Shahed A, Rajfer J. Quercetin in men with category III chronic prostatitis: A preliminary prospective, double-blind, placebo-controlled trial. Urol 1999;54:960-3. PubMed
- Starvic B. Quercetin in our diet: from potent mutagen to probable anticarcinogen. Clin Biochem 1994;27:245-8. PubMed
- Ferry DR, Smith A, Malkhandi J, et al. Phase I clinical trial of the flavonoid quercetin: Pharmacokinetics and evidence for in vivo tyrosine kinase inhibition. Clin Cancer Res 1996;2:659-67..
- Obach RS. Inhibition of human cytochrome P450 enzymes by constituents of St. John's wort, an herbal preparation used in the treatment of depression. J Pharmacol Exp Ther 2000;294:88-95. DOI
- Edwards RL, Lyon T, Litwin SE, et al. Quercetin reduces blood pressure in hypertensive subjects. J Nutr 2007;137:2405-11.
- Kim KA, Park PW, Kim HK, et al. Effect of quercetin on the pharmacokinetics of rosiglitazone, a CYP2C8 substrate, in healthy subjects. J Clin Pharmacol 2005;45:941-6. PubMed
- DiCenzo R, Frerichs V, Larppanichpoonphol P, et al. Effect of quercetin on the plasma and intracellular concentrations of saquinavir in healthy adults. Pharmacotherapy 2006;26:1255-61. PubMed
- Choi JS, Choi BC, Choi KE. Effect of quercetin on the pharmacokinetics of oral cyclosporine. Am J Health Syst Pharm 2004;61:2406-9. PubMed
- Choi JS, Jo BW, Kim YC. Enhanced paclitaxel bioavailability after oral administration of paclitaxel or prodrug to rats pretreated with quercetin. Eur J Pharm Biopharm 2004;57:313-8. PubMed
- Vaclavikova R, Horsky S, Simek P, Gut I. Paclitaxel metabolism in rat and human liver microsomes is inhibited by phenolic antioxidants. Naunyn Schmiedebergs Arch Pharmacol 2003;368:200-9. PubMed
- Di Bari L, Ripoli S, Pradhan S, Salvadori P. Interactions between quercetin and warfarin for albumin binding: A new eye on food/drug interference. Chirality 2010;22:593-6. PubMed
- Lamson, D. W. and Brignall, M. S. Antioxidants and cancer, part 3: quercetin. Altern.Med.Rev. 2000;5(3):196-208.
- Duan KM, Wang SY, Ouyang W, Mao YM, Yang LJ. Effect of quercetin on CYP3A activity in Chinese healthy participants. J Clin Pharmacol 2012;52(6):940-6. PubMed
- Wang SY, Duan KM, Li Y, et al. Effect of quercetin on P-glycoprotein transport ability in Chinese healthy subjects. Eur J Clin Nutr 2013;67(4):390-4. PubMed
- Nguyen MA, Staubach P, Wolffram S, Langguth P. Effect of single-dose and short-term administration of quercetin on the pharmacokinetics of talinolol in humans - Implications for the evaluation of transporter-mediated flavonoid-drug interactions. Eur J Pha PubMed
- Wu LX, Guo CX, Chen WQ, et al. Inhibition of the organic anion-transporting polypeptide 1B1 by quercetin: an in vitro and in vivo assessment. Br J Clin Pharmacol 2012;73(5):750-7.
- Ahrens MJ, Thompson DL. Effect of emulin on blood glucose in type 2 diabetics. J Med Food. 2013;16(3):211-5. PubMed
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See these in context on the N-acetyl Cysteine (nac) monograph →
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