Drug & supplement interaction

Zeaxanthin + Levothyroxine

Levothyroxine brand names: Euthyrox, Levothroid, Unithroid, Synthroid, Levoxyl, and others.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated June 2026 · Pair last verified Sep 13, 2026

The bottom line No known interaction

We found no known interaction between Zeaxanthin and Levothyroxine 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 Levothyroxine states a food rule worth keeping to.

Know someone taking this? Share

Facebook Post Reddit Email

On this page

Interaction report

Zeaxanthin and Levothyroxine

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 and Zeaxanthin 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.

Zeaxanthin safety at a glance

Zeaxanthin overall Generally safe Generally well tolerated when used at typical supplement amounts.

Pregnancy Likely Safe When used orally and appropriately in amounts found in foods. Zeaxanthin is found in breast milk and levels correlate with infant status. There is insufficient... Read the full pregnancy detail

Breastfeeding Likely Safe When used orally and appropriately in amounts found in foods. Zeaxanthin is found in breast milk and levels correlate with infant status. There is insufficient... Read the full breastfeeding detail

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.

Still wondering about combining Levothyroxine and Zeaxanthin? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

How we checked

Why No Interaction Is Listed for Levothyroxine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Levothyroxine is filed under 3 classifications — including thyroid hormone, oral drugs. Zeaxanthin has documented interactions with 1 drug class — the most serious being antidiabetes drugs (moderate) — and none of Levothyroxine’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

Zeaxanthin Does Interact With Other Medications

Zeaxanthin has 86 moderate known drug interactions in our database — Levothyroxine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. Levothyroxine)

Taking anything else?

Check Another of Your Medications Against Zeaxanthin

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

What to actually watch for

What Levothyroxine’s Own FDA Label Lists

This is not an interaction — none of it involves Zeaxanthin. These are the most notable effects listed in the ADVERSE REACTIONS section of Levothyroxine’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 Levothyroxine. Read the label on DailyMed › Zeaxanthin’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Zeaxanthin side to compare — that is a limit of the record, not a statement that Zeaxanthin has no side effects.

Special populations

Zeaxanthin in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally and appropriately in amounts found in foods. Zeaxanthin is found in breast milk and levels correlate with infant status. There is insufficient reliable information available about the safety of supplemental zeaxanthin.

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

How to take them

Some Levothyroxine Products Have a Food Rule — Zeaxanthin Should Not Break It

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

From our Q&A

Questions About Zeaxanthin or Levothyroxine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Zeaxanthin or Levothyroxine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Levothyroxine

This page covers Zeaxanthin only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Levothyroxine 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 page

“Levothyroxine replaces a hormone your body measures in tiny amounts, so small shifts in its blood level show up in how you feel, and I treat this list with genuine care. Nearly everything on it does one of two things: blocks the pill from being absorbed in the gut, the way everyday minerals like calcium do by binding it into complexes,…”

Reviewed by 2 · Jul 18, 2026

Open the Levothyroxine interaction page

One more smart check

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

We hold 3,239 real supplement products containing Zeaxanthin, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Zeaxanthin. Even though Zeaxanthin itself has no known interaction with Levothyroxine, 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 Zeaxanthin and Levothyroxine 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 Zeaxanthin

Top 10%

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

29 days ago today

Medication Levothyroxine

Top 10

#2 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 Zeaxanthin reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Zeaxanthin and Levothyroxine 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 Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Zeaxanthin

What is Zeaxanthin?

Eye and macular health
Age-related macular degeneration (AMD)
Protection from blue light
General antioxidant support
Cataract risk reduction

Zeaxanthin is a carotenoid pigment that, along with lutein, concentrates in the macula of the eye and may help support long-term eye health. The strongest evidence relates to slowing progression of advanced age-related macular degeneration when combined with other nutrients, while many other uses remain unproven. It is generally well tolerated, but talk to your pharmacist or doctor before starting any supplement.

Pigment found in leafy greens, corn, eggs, and other colorful plants and foods · Capsules, softgels, tablets (often combined with lutein), and as part of multivitamin or eye-health formulas

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

Zeaxanthin: dosing

There is no official, universally established dose of zeaxanthin. In eye-health research, it has typically been studied as part of a nutrient combination that includes lutein, often at much smaller amounts than lutein.Because products vary widely, the best approach is to follow the directions on the product label. Zeaxanthin is frequently combined with lutein, so check the full ingredient list.

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

Read the full Zeaxanthin monograph & all interactions

Medication

About Levothyroxine

What Is Levothyroxine Used For?

Brand names: Euthyrox, Levothroid, Unithroid, Synthroid, Levoxyl, Levo-T, Eltroxin, Estre, Levothyroxine, Novothyrox, Levolet

Levothyroxine replaces or supplements the thyroid hormone your body isn't making enough of. It's used for hypothyroidism — an underactive thyroid — in adults, children, and even newborns, whether the cause is the thyroid gland itself, the pituitary gland, or the hypothalamus in the brain.

It's also used alongside surgery and radioiodine treatment in people with certain types of thyroid cancer, to help suppress the hormone that can stimulate cancer growth. It is not meant for weight loss, treating benign thyroid nodules in people who have enough iodine, or for hypothyroidism during recovery from a temporary condition called subacute thyroiditis.

See full Levothyroxine drug information

Keep checking

Other Drugs & Zeaxanthin

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

0Major

86Moderate

0Minor

2,743No known interaction

86 Moderate 2,743 No interaction

Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Zeaxanthin page.

No interaction 2,743 drugs checked — show the list

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

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full Zeaxanthin list.

See the full Zeaxanthin interactions page

See every supplement checked against Levothyroxine, ranked by severity

Evidence & sources

Zeaxanthin References

The 4 references that drive our Zeaxanthin 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.

Montonen J, Knekt P, Jarvinen R, Reunanen A. Dietary antioxidant intake and risk of type 2 diabetes. Diabetes Care 2004;27:362-6. PubMed
Leermakers ET, Darweesh SK, Baena CP, et al. The effects of lutein on cardiometabolic health across the life course: a systematic review and meta-analysis. Am J Clin Nutr 2016;103(2):481-94. PubMed
Kou L, Du M, Zhang C, Dai Z, Li X, Zhang B. The Hypoglycemic, Hypolipidemic, and Anti-Diabetic Nephritic Activities of Zeaxanthin in Diet-Streptozotocin-Induced Diabetic Sprague Dawley Rats. Appl Biochem Biotechnol 2017;182(3):944-955. PubMed
Xu X, Zhao X, Berde Y, Low YL, Kuchan MJ. Milk and Plasma Lutein and Zeaxanthin Concentrations in Chinese Breast-Feeding Mother-Infant Dyads With Healthy Maternal Fruit and Vegetable Intake. J Am Coll Nutr 2019;38(2):179-184. 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 Zeaxanthin and Levothyroxine Together: Common Questions

Is it safe to take Zeaxanthin with Levothyroxine?

We do not list a known interaction between Zeaxanthin and Levothyroxine. 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 Zeaxanthin and Levothyroxine at the same time of day?

At least one FDA label for a product containing Levothyroxine 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 Levothyroxine on its own and move Zeaxanthin 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.

How was the Zeaxanthin and Levothyroxine combination checked?

Interactions in our licensed database are recorded against drug classes. Levothyroxine is filed under 3 classifications, and Zeaxanthin has documented interactions with 1 drug class — none of Levothyroxine'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 Zeaxanthin interact with any other medications?

Yes. Zeaxanthin has 86 documented drug interactions in our database — Levothyroxine 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 Levothyroxine interact with any supplements?

Yes. Levothyroxine has documented interactions with 50 supplements in our database — Zeaxanthin is not one of them. The Levothyroxine 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

Zeaxanthin monograph Uses, safety profile, and every drug interaction in one place Levothyroxine drug information The full plain-English guide to this medication Levothyroxine supplement interactions Every supplement checked against Levothyroxine, 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 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Levothyroxine and Zeaxanthin?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.