Cotton + Levothyroxine, Liothyronine
Levothyroxine, Liothyronine brand name: Armour Thyroid.
We found no known interaction between Cotton and Levothyroxine, Liothyronine 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.
Cotton and Levothyroxine, Liothyronine
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 Levothyroxine, Liothyronine and Cotton 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 Cotton at all — not against Levothyroxine, Liothyronine, 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.
Cotton safety at a glance
Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Cotton in Pregnancy & Breastfeeding
When used orally because it is a possible abortifacient and uterine stimulant.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center
See Every Supplement That Interacts With Levothyroxine, Liothyronine
This page covers Cotton only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Levothyroxine, Liothyronine page lists 50 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 · 39 moderate · 9 minor.
From our pharmacist’s overview on the Levothyroxine, Liothyronine page
“For anyone taking levothyroxine or liothyronine (Armour Thyroid), this list earns real caution, not just a passing glance. Most of these 50 ingredients pull in one of two directions.”
Reviewed by 2 · Jul 18, 2026
Taking Cotton as Part of a Dietary Supplement Product? Check It for Interactions
We hold 8 real supplement products containing Cotton, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Cotton. Even though Cotton itself has no known interaction with Levothyroxine, Liothyronine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Cotton and Levothyroxine, Liothyronine 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.
#844 of 1,452 supplements looked up here in the last 7 days
#61 of 2,830 medications looked up here in the last 7 days
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 Cotton reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Cotton and Levothyroxine, Liothyronine records this page draws on were last updated July 11, 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.
About Cotton
What is Cotton?
- Menstrual cramps and bringing on menses
- Cooking oil (cottonseed oil)
- Traditional use as a contraceptive (gossypol)
- Breast milk flow (traditional)
- Skin and wound care (folk use)
Cotton is best known as a fiber and food-oil crop, but its root bark and seed have a long history in folk medicine for menstrual and reproductive complaints. Its seed pigment, gossypol, was studied as a male contraceptive but proved too toxic, and there is no good evidence that cotton supplements are safe or effective for any health condition. Talk to a pharmacist or doctor before using any cotton-derived product medicinally.
Gossypium hirsutum · Malvaceae · Root bark, seed, and seed oil (cottonseed oil) · Cottonseed oil, root bark extract/tincture, capsules
An interaction check asks whether these two react with each other — it does not ask whether Cotton is a good idea for someone in your situation. Here is what our Cotton record says about it on its own.
Cotton: dosing
There is no established safe or effective dose for cotton as a dietary supplement. Do not try to make your own preparations from cotton plant material.
From our Cotton monograph — the full record covers uses, side effects and every documented interaction.
About Levothyroxine, Liothyronine
Most-Reported Side Effects for Levothyroxine, Liothyronine
From FAERS, the FDA’s public side-effect reporting system (15 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.
Other Drugs & Cotton
Browse every other medication we’ve checked against Cotton — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Cotton against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Testosterone ›
- Losartan Potassium ›
- Metoprolol ›
- Aspirin ›
- Ivermectin ›
- Rivaroxaban ›
- Rosuvastatin ›
- Escitalopram ›
- Tadalafil ›
- Acetaminophen ›
- Clopidogrel ›
- Valacyclovir ›
- Atorvastatin ›
- Docusate ›
- Hydroxyurea ›
- Abemaciclib ›
- Methamphetamine ›
- Ibuprofen ›
- Sumatriptan ›
- Semaglutide ›
- Tirzepatide ›
- Warfarin Sodium ›
- Prednisone ›
- Propranolol ›
- Lisdexamfetamine ›
- Acyclovir ›
- Bupropion ›
- Metformin ›
- Amoxicillin ›
- Lisinopril ›
- Bendamustine ›
- Amitriptyline ›
- Doxycycline ›
- Lamotrigine ›
- Fluoxetine ›
- Methotrexate ›
- Acetaminophen, Codeine ›
- Gabapentin ›
- Amphetamine ›
- Pregabalin ›
- Isotretinoin ›
- Dextroamphetamine ›
- Azithromycin ›
- Clonazepam ›
- Quetiapine ›
- Omeprazole ›
- Amlodipine Besylate ›
- Methylene Blue ›
- Duloxetine ›
- Letrozole ›
- Buspirone ›
- Citalopram ›
- Ciprofloxacin ›
- Naproxen ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Cotton list.
Cotton References
The 2 references that drive our Cotton 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.
- McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
- Ankrah, N. A., Nyarko, A. K., Addo, P. G., Ofosuhene, M., Dzokoto, C., Marley, E., Addae, M. M., and Ekuban, F. A. Evaluation of efficacy and safety of a herbal medicine used for the treatment of malaria. Phytother.Res 2003;17(6):697-701. 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.
Taking Cotton and Levothyroxine, Liothyronine Together: Common Questions
Is it safe to take Cotton with Levothyroxine, Liothyronine?
Does Levothyroxine, Liothyronine interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Still Have a Question About Levothyroxine, Liothyronine and Cotton?
Our pharmacists answer your medication & supplement questions — free.
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.