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Dietary supplement

Full Spectrum Nova Scotia Dulse 400 mg Ingredients & Drug Interactions

by Swanson Premium Brand

Full Spectrum Nova Scotia Dulse 400 mg label
See full label image
Capsule Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Full Spectrum Nova Scotia Dulse 400 mg 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

The interaction bottom line Most serious interaction: Moderate

Full Spectrum Nova Scotia Dulse 400 mg is a dietary supplement by Swanson Premium Brand with 1 active ingredient. Its ingredients are commonly taken for nutritional supplement (iodine, minerals), source of plant protein, general wellness.Based on those ingredients, 85 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Nova Scotia Dulse. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand

Ask about any prescription or over-the-counter medication and we check it for interactions with Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand

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.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 30, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: Nova Scotia Dulse, 400 mg per capsule. Dulse is a type of seaweed that's naturally rich in iodine and potassium.

The capsule also holds three inactive ingredients (gelatin, rice flour, and magnesium stearate) that serve as the capsule shell and flow agents.

Does it work?

Couldn't assess
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not assessable

This is a single-ingredient Dulse product and its label doesn't state a use — see Dulse's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence for dulse in our data is not established. It's been studied for high cholesterol and iodine deficiency, but we have insufficient reliable evidence to rate how well it works for either condition.

The evidence, ingredient by ingredient Dulse

How safe is it?

Some data gaps
Safety Information · database check
Some gaps

Safety data exists for these ingredients, but with some important gaps.

Why this rating?
  • We hold adverse-effect (side-effect) data for 0 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Dulse is generally well tolerated when you eat it as a food, but as a concentrated supplement it warrants caution. The main concern is that supplements can contain unpredictably high levels of iodine and potassium, and safety data on those levels is limited.

During pregnancy and lactation, supplement doses are not advised — excess iodine can pass into breast milk — so check with your doctor or pharmacist before taking this if you're pregnant or nursing.

Side effects, ingredient by ingredient Dulse

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Dulse.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: heart-rhythm medications.
  • For scale: 85 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your doctor or pharmacist before taking this if you're on digoxin or amiodarone (heart medications), thyroid hormone or antithyroid drugs, potassium-sparing diuretics, ACE inhibitors, or ARBs — these have documented moderate or minor theoretical interactions with dulse's potassium and iodine content.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and some safety-information gaps remain.

Nova Scotia Dulse is primarily a concern if you take heart medications (digoxin, amiodarone), thyroid drugs, blood pressure medications in certain classes, or diuretics. The seaweed itself is safe as food, but this supplement form carries theoretical risks because of its concentrated iodine and potassium.

Before you start, run it past your own doctor or pharmacist, especially if you have any thyroid or heart condition.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jan 7, 2019.

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

At a glance

General information

Key facts about Full Spectrum Nova Scotia Dulse 400 mg, straight from the product label.

Brand Swanson Premium Brand
Barcode (UPC) 087614113593
Net contents 60 Capsule(s)
Market status On market
Date entered into DSLD Jan 7, 2019
DSLD ID 184436
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
From the label
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 Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
UPC/BARCODE
087614113593
IngredientAmount% DV
Nova Scotia Dulse400 mg--

Other ingredients: Gelatin, Rice Flour, Magnesium Stearate

Tap any ingredient to jump to its full detail below.

Label statements
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.
General Statements

Bringing wellness to the world since 1969

To reorder, call toll free 1-800-437-4148 or visit our website at www.swansonvitamins.con

Formula

Purple Seaweed

FDA Statement of Identity

Herbal Supplement

Seals/Symbols

Guaranteed purity & potency

Precautions

Do not use if seal is broken.

Keep out of reach of children.

Storage

Store in a cool, dry place.

Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement, take one capsule per day with water.

General

SW1359 Rev 0 05 01 18

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Full Spectrum Nova Scotia Dulse 400 mg label

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)
What’s inside

The Ingredients in Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Amounts shown are per serving.

Nova Scotia Dulse

Interacts with
85 drugs
400 mg per serving

Dulse is a red seaweed eaten as a food in many coastal cultures and is a natural source of iodine, potassium, protein, and antioxidant compounds. As a...

Nova Scotia Dulse monograph & interactions

Other (inactive) ingredients: Gelatin, Rice Flour, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand Drug Interactions

Want to check YOUR meds against Full Spectrum Nova Scotia Dulse 400 mg?

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 checker
85Drugs
23 Moderate 62 Minor

Ingredients driving the most interactions

Nova Scotia Dulse 85

Individual Drug Interactions

The ingredients in Full Spectrum Nova Scotia Dulse 400 mg interact with 85 drugs. Click any drug to see the details.

1 of the 1 ingredient in Full Spectrum Nova Scotia Dulse 400 mg interact with drugs. Each result below shows which ingredient is responsible. Nova Scotia Dulse

Each ingredient & the kinds of drugs it affects

For each ingredient in Full Spectrum Nova Scotia Dulse 400 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Nova Scotia Dulse7 drug types · 85 drugs

Amiodarine (Cordarone)

Theoretically, combining dulse with amiodarone might cause excessively high iodine levels.
Dulse is rich in iodine, and amiodarone contains 37.3% iodine and can increase iodine levels.

Likelihood Possible Evidence D
Antithyroid Drugs

Theoretically, due to its iodine content, dulse might alter the effects of antithyroid drugs.
Dulse is rich in iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history.

Likelihood Possible Evidence D
Digoxin (Lanoxin)

Theoretically, dulse might increase the risk of hyperkalemia when taken with digoxin.
Dulse is rich in potassium, and digoxin can increase potassium levels in the blood. This interaction has not been demonstrated in humans.

Likelihood Possible Evidence D
Thyroid Hormone

Theoretically, due to its iodine content, dulse might alter the effects of thyroid hormone.
Dulse is rich in iodine. Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Although dulse has been associated with a statistically significant increase in thyroid stimulating hormone (TSH) levels in clinical research, clinically significant increases have not been documented.

Likelihood Possible Evidence D
Ace Inhibitors (Aceis)

Theoretically, dulse might increase the risk of hyperkalemia when taken with ACEIs.
Dulse is rich in potassium. ACEIs block the actions of the renin-angiotensin-aldosterone system and reduce potassium excretion. Concomitant use of these drugs with moderate dietary potassium intake (about 3775-5200 mg daily) does not increase serum potassium levels. However, using these drugs while consuming dulse in quantities that provide larger amounts of potassium daily might increase the risk of hyperkalemia. Additionally, in vitro research suggests that dulse protein hydrolysates inhibit the activity of ACE. However, these effects have not been demonstrated in humans.

Likelihood Possible Evidence D
Angiotensin Receptor Blockers (Arbs)

Theoretically, dulse might increase the risk of hyperkalemia when taken with ARBs.
Dulse is rich in potassium. ARBs block the actions of the renin-angiotensin-aldosterone system and reduce potassium excretion. Concomitant use of these drugs with moderate dietary potassium intake (about 3775-5200 mg daily) does not increase serum potassium levels. However, using these drugs while consuming dulse in quantities that provide higher amounts of potassium daily might increase the risk of hyperkalemia. Additionally, in vitro research suggests that dulse protein hydrolysates inhibit the activity of angiotensin converting enzyme (ACE). However, these effects have not been demonstrated in humans.

Likelihood Possible Evidence D
Potassium-Sparing Diuretics

Theoretically, dulse might increase the risk of hyperkalemia when taken with potassium-sparing diuretics.
Dulse is rich in potassium, and potassium-sparing diuretics can increase potassium levels in the blood. This interaction has not been shown in humans.

Likelihood Possible Evidence D
Nova Scotia Dulse full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Full Spectrum Nova Scotia Dulse 400 mg, from the product label.

Swanson Premium Brand

See all Swanson Premium Brand products
Name
Swanson Health Products
City
Fargo
State
ND
ZipCode
58104
Phone Number
1-800-437-4148
Web Address
www.swansonvitamins.com
Pharmacist Counseling Corner

Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand: Common Questions

Does Full Spectrum Nova Scotia Dulse 400 mg by Swanson Premium Brand interact with any medications?
Yes. Based on its ingredients, Full Spectrum Nova Scotia Dulse 400 mg has a known interaction with 85 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Full Spectrum Nova Scotia Dulse 400 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Is dulse the same thing as a seaweed supplement?
Dulse is a type of red seaweed harvested off the Nova Scotia coast. This product contains dulse in a 400 mg capsule form, making it a concentrated supplement rather than the whole food.
Can I take this if I have a thyroid condition?
You need to talk with your doctor or pharmacist first. Dulse is high in iodine, which can affect how thyroid hormones and thyroid medications work, and the effect depends on your individual medical history. Don't start this without checking.
Is it safe to take during pregnancy?
There isn't enough data to know either way, and excess iodine from supplements can pass into breast milk. Talk with your doctor or pharmacist before taking this supplement if you're pregnant or nursing — food amounts are likely fine, but the concentrated supplement form needs personalized advice.
What does dulse actually do?
It's been studied for cholesterol and iodine deficiency, but we don't have enough reliable evidence in our data to say how well it works for either one.
Why does this interact with so many heart and blood pressure medications?
Dulse is naturally high in potassium and iodine. Several heart and blood pressure drugs (like digoxin, amiodarone, ACE inhibitors, and ARBs) affect how your body handles potassium, so adding a potassium-rich supplement creates a theoretical risk of potassium building up to unsafe levels. Iodine-rich dulse can also interfere with how your body regulates thyroid function.

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.

Full Spectrum Nova Scotia Dulse 400 mg label
Go deeper

The Full Monographs Behind Full Spectrum Nova Scotia Dulse 400 mg’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Dulse

Interacts with 85 drugs

Dulse is a red seaweed eaten as a food in many coastal cultures and is a natural source of iodine, potassium, protein, and antioxidant compounds. As a food it is generally considered safe fo...

Read the full Dulse monograph →
Sources

Sources & How We Checked

Full Spectrum Nova Scotia Dulse 400 mg'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.

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 5 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.

Dulse 5 references
  1. Malta D, Arcand J, Ravindran A, Floras V, Allard JP, Newton GE. Adequate intake of potassium does not cause hyperkalemia in hypertensive individuals taking medications that antagonize the renin angiotensin aldosterone system. Am J Clin Nutr 2016 Oct;104(4 PubMed
  2. Allsopp P, Crowe W, Bahar B, et al. The effect of consuming Palmaria palmata-enriched bread on inflammatory markers, antioxidant status, lipid profile and thyroid function in a randomised placebo-controlled intervention trial in healthy adults. Eur J Nutr PubMed
  3. McGrath BM, Harmon JP, Bishop G. Palmaria palmata (Dulse) as an unusual maritime aetiology of hyperkalemia in a patient with chronic renal failure: a case report. J Med Case Rep. 2010;4:301. PubMed
  4. Furuta T, Miyabe Y, Yasui H, Kinoshita Y, Kishimura H. Angiotensin I converting enzyme inhibitory peptides derived from phycobiliproteins of dulse Palmaria palmata. Mar Drugs. 2016;14(2):32. PubMed
  5. Takase T, Nakamura A, Miyoshi H, et al. Effects of Palmaria palmata on lipid metabolism and glycemic control in participants with hypercholesterolemia in a randomized double-blind placebo-controlled trial. Phytother Res. 2020.

See these in context on the Dulse monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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