Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

Organic Kelp Powder 5 g Unflavored Ingredients & Drug Interactions

by Nutricost Organic

Organic Kelp Powder 5 g Unflavored label
See full label image
Powder Category: Mineral
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 Organic Kelp Powder 5 g Unflavored 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

Organic Kelp Powder 5 g Unflavored is a dietary supplement by Nutricost Organic with 1 active ingredient. Its ingredients are commonly taken for preventing iodine deficiency, supporting thyroid hormone production, general energy and metabolism support.Based on those ingredients, 7 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Iodine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Organic Kelp Powder 5 g Unflavored by Nutricost Organic

Ask about any prescription or over-the-counter medication and we check it for interactions with Organic Kelp Powder 5 g Unflavored by Nutricost Organic — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
Prefer a human? Send your question to our licensed pharmacists — free, answered by email within 24 hours.

HelloPharmacist Scorecard of Organic Kelp Powder 5 g Unflavored by Nutricost Organic

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 Sep 3, 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 is pure iodine from organic kelp—a single active ingredient in a 5 gram powder form. There are no inactive ingredients listed.

Iodine is an essential mineral your body needs to make thyroid hormones, which control your metabolism and energy. It's naturally found in seafood, dairy, and eggs, but kelp is a concentrated source.

Does it work?

Strong evidence
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

This product doesn't appear to be marketed for a specific use, so we graded Iodine's overall clinical evidence instead.

Strong

Strong clinical evidence supports Iodine for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Radiation exposure — rated "Likely Effective" (Natural Medicines).
  • On file: Iodine deficiency — rated "Likely Effective" (Natural Medicines).
  • On file: Fibrocystic breast disease — rated "Possibly Effective" (Natural Medicines).
  • On file: Oral mucositis — rated "Possibly Effective" (Natural Medicines).
  • On file: Periodontitis — rated "Possibly Effective" (Natural Medicines).

The data supports iodine for preventing or treating iodine deficiency and protecting your thyroid after radiation exposure—both rated likely effective. There's also possibly effective evidence for iodine in treating mouth sores (oral mucositis) and gum disease (periodontitis), though the evidence here is weaker.

The evidence, ingredient by ingredient Iodine

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 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.

Iodine from food sources and normal amounts is well tolerated. The main caution is that high doses can cause thyroid problems—either too much (hyperthyroidism) or too little (hypothyroidism) thyroid function, and you can also develop a goiter (enlarged thyroid).

The most common side effects at excessive doses are nausea, diarrhea, headache, metallic taste, and nasal drainage. Rarely, some people can have a hypersensitivity reaction with rash, swelling, or fever.

In pregnancy, adequate iodine matters for your baby's development, but you should use only the amount your doctor advises and avoid high-dose products. During breastfeeding, some iodine passes into milk, so follow your doctor's guidance rather than self-dosing.

Side effects, ingredient by ingredient Iodine

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 — Iodine.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: lithium.
  • For scale: 7 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 using this product if you take lithium, any antithyroid drug, or amiodarone (Cordarone). All three have Moderate interactions with iodine that can affect how well your thyroid works.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with strong clinical evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.

This kelp powder is a straightforward source of iodine, useful if you're deficient or need it for thyroid health. If you take lithium, antithyroid drugs, or amiodarone, talk with your doctor or pharmacist before starting it—these medications need special attention with iodine.

In pregnancy and breastfeeding, check with your doctor about the right dose for you.

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 24, 2024.

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 Organic Kelp Powder 5 g Unflavored, straight from the product label.

Brand Nutricost Organic
Barcode (UPC) 810014671918
Net contents 16 Ounce(s); 1 Pound(s); 454 Gram(s)
Market status On market
Date entered into DSLD Jan 24, 2024
DSLD ID 306370
Product type Mineral
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegetarian, Adult (18 - 50 Years), Organic, Gluten Free
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 Organic Kelp Powder 5 g Unflavored by Nutricost Organic, 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:
5 Gram(s)
Maximum serving Sizes:
5 Gram(s)
Servings per container
91
UPC/BARCODE
810014671918
IngredientAmount% DV
Calories15 Calorie(s)--
Total Carbohydrates3 Gram(s)1%
Iodine3250 mcg2170%

Other ingredients: None

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.
Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement, mix 1 scoop daily with 6-10 oz of water or as directed by your healthcare professional.

Formulation

Third party tested

Non-GMO Gluten-free

Made and quality tested in the USA with globally sourced ingredients.

Certified Organic by CCOF

CCOF Certified Organic USDA Organic

Vegetarian Product

Non-GMO Product

Precautions

Warning: For healthy individuals 18 years and older.

Consult a healthcare professional prior to use if you are pregnant or nursing, taking medication, or have a medical condition.

Keep out of reach of children.

Do not use if safety seal is broken or missing.

Storage

Notice: Store in a cool, dry place.

General Statements

Contents are sold by weight, not volume. Some settling may occur.

Seals/Symbols

CCOF Certified Organic USDA Organic

Quality Nutricost Guaranteed

Formula

Natural source of Iodine Organic Kelp Powder 5G per serving 1LB per container

FDA Statement of Identity

Dietary Supplement

FDA Disclaimer Statement

These statements have 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.

See for yourself

Organic Kelp Powder 5 g Unflavored by Nutricost Organic label

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

Organic Kelp Powder 5 g Unflavored 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 Organic Kelp Powder 5 g Unflavored by Nutricost Organic

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

Serving size5 Gram(s) Dosage formPowder Servings per container91 Amounts shown are per serving.

Iodine

Interacts with
7 drugs
3250 mcg per serving

Iodine is an essential mineral your body needs to make thyroid hormones, and most people get enough from iodized salt, dairy, and seafood. Supplements...

Iodine monograph & interactions

Other (inactive) ingredients: None. These complete the product’s ingredient list but are not active constituents.

Interaction report

Organic Kelp Powder 5 g Unflavored by Nutricost Organic Drug Interactions

Want to check YOUR meds against Organic Kelp Powder 5 g Unflavored?

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
7Drugs
7 Moderate

Ingredients driving the most interactions

Iodine 7

Individual Drug Interactions

The ingredients in Organic Kelp Powder 5 g Unflavored interact with 7 drugs. Click any drug to see the details.

1 of the 1 ingredient in Organic Kelp Powder 5 g Unflavored interact with drugs. Each result below shows which ingredient is responsible. Iodine

Each ingredient & the kinds of drugs it affects

For each ingredient in Organic Kelp Powder 5 g Unflavored 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.

Iodine3 drug types · 7 drugs

Amiodarone (Cordarone)

Combining iodine with amiodarone might cause excessively high iodine levels.
Amiodarone contains 37.3% iodine and can increase iodine levels. Concomitant use with iodine might increase the risk of having excessive iodine levels and adversely affecting thyroid function. Monitor thyroid function.

Likelihood Probable Evidence D
Antithyroid Drugs

Iodine might alter the effects of antithyroid drugs.
Iodine in high doses has been reported to cause both hyperthyroidism and hypothyroidism, depending on the individual's past medical history. Taking iodine while using antithyroid drugs could alter the effects of the antithyroid drugs.

Likelihood Probable Evidence D
Lithium

Combining iodine with lithium might have additive hypothyroid effects.
Lithium can inhibit thyroid function. Several case reports suggest that concomitant use of lithium and potassium iodide can reduce thyroid function in otherwise healthy adults. Monitor thyroid function.

Likelihood Probable Evidence D
Iodine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Organic Kelp Powder 5 g Unflavored, from the product label.

Nutricost Organic

See all Nutricost Organic products
Name
Nutricost
Street Address
351 E 1750 N
City
Vineyard
State
UT
ZipCode
84059
Phone Number
(866) 438-3694
Web Address
www.nutricost.com
Pharmacist Counseling Corner

Organic Kelp Powder 5 g Unflavored by Nutricost Organic: Common Questions

Does Organic Kelp Powder 5 g Unflavored by Nutricost Organic interact with any medications?
Yes. Based on its ingredients, Organic Kelp Powder 5 g Unflavored has a known interaction with 7 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Organic Kelp Powder 5 g Unflavored 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.
Can I take kelp powder if I'm pregnant or breastfeeding?
Your baby needs iodine during pregnancy, and some passes into breast milk, so the mineral itself isn't off-limits. But you need to use only the amount your doctor advises—not a self-chosen high-dose product. Talk with your doctor or pharmacist about the right approach for you.
What are the side effects of taking too much iodine?
At high doses, iodine commonly causes nausea, diarrhea, headache, metallic taste, and runny nose. More seriously, excess iodine can interfere with thyroid function, causing either an overactive or underactive thyroid, or a swollen thyroid gland (goiter). In rare cases, people can have an allergic-type reaction with rash, swelling, or fever.
Is this product safe if I have a thyroid condition?
If you take antithyroid medications or lithium, this product requires your doctor's okay—iodine can change how these drugs work and affect your thyroid function. Even if you don't take medication but have a thyroid condition, it's worth confirming with your doctor that this dose is right for you.
Does kelp powder really prevent iodine deficiency?
Yes—iodine from kelp is rated likely effective for treating or preventing iodine deficiency. That said, most people in areas with iodized salt don't actually lack iodine, so check with your doctor before assuming you need it.
What is iodine used for in the body?
Iodine is essential for making thyroid hormones, which regulate your metabolism, energy, growth, and how your body uses calories. Without enough iodine, your thyroid can't work properly.
Can this help with mouth sores or gum disease?
The evidence suggests iodine is possibly effective for both oral mucositis (mouth sores) and periodontitis (gum disease), but the evidence is weaker than for iodine deficiency. Talk with your dentist or doctor if you're considering it for these conditions.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Organic Kelp Powder 5 g Unflavored is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.

Organic Kelp Powder 5 g Unflavored label
Go deeper

The Full Monographs Behind Organic Kelp Powder 5 g Unflavored’s Ingredients

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

Herb & supplement monograph

Iodine

Interacts with 7 drugs

Iodine is an essential mineral your body needs to make thyroid hormones, and most people get enough from iodized salt, dairy, and seafood. Supplements help when you are truly deficient, but...

Read the full Iodine monograph →
Sources

Sources & How We Checked

Organic Kelp Powder 5 g Unflavored'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 26 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.

Iodine 26 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Goodman GA, Rall TW, Nies AS, Taylor P. The Pharmacological Basis of Therapeutics, 9th ed.
  3. Ghent WR, Eskin BA, Low DA, Hill LP. Iodine replacement in fibrocystic disease of the breast. Can J Surg 1993;36:453-60.
  4. Potassium iodide for nuclear exposure. Pharmacist's Letter/Prescriber's Letter 2001;17(12):171214.
  5. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
  6. Cabezas C, Bustamante B, Holgado W, Begue RE. Treatment of cutaneous sporotrichosis with one daily dose of potassium iodide. Pediatr Infect Dis J 1996;15:352-4. PubMed
  7. Sterling JB, Heymann WR. Potassium iodide in dermatology: a 19th century drug for the 21st century-uses, pharmacology, adverse effects, and contraindications. J Am Acad Dermatol 2000;43:691-7. PubMed
  8. Yarrington CD, Pearce EN. Dietary iodine in pregnancy and postpartum. Clin Obstet Gynecol 2011;54:459-70. PubMed
  9. Goel, S., Mandhani, A., Srivastava, A., Kapoor, R., Gogoi, S., Kumar, A., and Bhandari, M. Is povidone iodine an alternative to silver nitrate for renal pelvic instillation sclerotherapy in chyluria? BJU.Int 2004;94(7):1082-1085. PubMed
  10. Teng, W., Shan, Z., Teng, X., Guan, H., Li, Y., Teng, D., Jin, Y., Yu, X., Fan, C., Chong, W., Yang, F., Dai, H., Yu, Y., Li, J., Chen, Y., Zhao, D., Shi, X., Hu, F., Mao, J., Gu, X., Yang, R., Tong, Y., Wang, W., Gao, T., and Li, C. Effect of iodine int
  11. Crawford, B. A., Cowell, C. T., Emder, P. J., Learoyd, D. L., Chua, E. L., Sinn, J., and Jack, M. M. Iodine toxicity from soy milk and seaweed ingestion is associated with serious thyroid dysfunction. Med J Aust. 10-4-2010;193(7):413-415. PubMed
  12. Ohkuma, M. Molluscum contagiosum treated with iodine solution and salicylic acid plaster. Int J Dermatol. 1990;29(6):443-445. PubMed
  13. Connelly KJ, Boston BA, Pearce EN, Sesser D, Snyder D, Braverman LE, Pino S, LaFranchi SH. Congenital hypothyroidism caused by excess prenatal maternal iodine ingestion. J Pediatr. 2012 Oct;161(4):760-2. PubMed
  14. Kasahara T, Narumi S, Okasora K, Takaya R, Tamai H, Hasegawa T. Delayed onset congenital hypothyroidism in a patient with DUOX2 mutations and maternal iodine excess. Am J Med Genet A. 2013 Jan;161A(1):214-7.
  15. Murcia M, Rebagliato M, Iñiguez C, Lopez-Espinosa MJ, Estarlich M, Plaza B, Barona-Vilar C, Espada M, Vioque J, Ballester F. Effect of iodine supplementation during pregnancy on infant neurodevelopment at 1 year of age. Am J Epidemiol. 2011 Apr 1;173(7):8 PubMed
  16. Sang Z, Wang PP, Yao Z, Shen J, Halfyard B, Tan L, Zhao N, Wu Y, Gao S, Tan J, Liu J, Chen Z, Zhang W. Exploration of the safe upper level of iodine intake in euthyroid Chinese adults: a randomized double-blind trial. Am J Clin Nutr. 2012 Feb;95(2):367-73 PubMed
  17. Speeckaert MM, Speeckaert R, Wierckx K, Delanghe JR, Kaufman JM. Value and pitfalls in iodine fortification and supplementation in the 21st century. Br J Nutr. 2011 Oct;106(7):964-73. PubMed
  18. Yun SE, Kang Y, Bae EJ, Hwang K, Jang HN, Cho HS, Chang SH, Park DJ. Iodine-induced thyrotoxic hypokalemic paralysis after ingestion of Salicornia herbace. Ren Fail. 2014 Apr;36(3):461-3.
  19. Iodine Hypersensitivity. Pharmacist's Letter/Prescriber's Letter 2011; 27(5):270504.
  20. Hammel JA, Selby JC. Pustular eruption in a patient with cancer treated with complementary and alternative medicine. JAMA Dermatology 2017 October; E1. doi: 10.1001/jamadermatol.2017.3749. [Epub ahead of print] PubMed
  21. Gil GS, Smith BW, Guerra JR, Williams WT. Acute Delirium in a Hypothyroid Patient Precipitated by Iodine Supplements Use. Am J Ther. 2018;25(6):e717-e718. PubMed
  22. Hamby T, Kunnel N, Dallas JS, Wilson DP. Maternal iodine excess: an uncommon cause of acquired neonatal hypothyroidism. J Pediatr Endocrinol Metab. 2018;31(9):1061-1064. PubMed
  23. Censi S, Watutantrige-Fernando S, Groccia G, et al. The Effects of Iodine Supplementation in Pregnancy on Iodine Status, Thyroglobulin Levels and Thyroid Function Parameters: Results from a Randomized Controlled Clinical Trial in a Mild-to-Moderate Iodine
  24. Rovner MS, Wolf BJ, Rubin M, et al. Instillation of 5% Povidone-Iodine Ophthalmic Drops Decreases the Respiratory Rate in Children Undergoing Strabismus Surgery: A Randomized Controlled Trial. J Pediatr Ophthalmol Strabismus. 2019;56(6):378-382. PubMed
  25. Guenezan J, Garcia M, Strasters D, et al. Povidone Iodine Mouthwash, Gargle, and Nasal Spray to Reduce Nasopharyngeal Viral Load in Patients With COVID-19: A Randomized Clinical Trial. JAMA Otolaryngol Head Neck Surg. 2021;147(4):400-401. PubMed
  26. Li F, Wan S, Zhang L, et al. A Meta-Analysis of the Effect of Iodine Excess on the Intellectual Development of Children in Areas with High Iodine Levels in their Drinking Water. Biol Trace Elem Res 2022;200(4):1580-1590. PubMed

See these in context on the Iodine 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

Keep exploring
Supplement interaction checker › Check any supplement or product against your medications Drug–drug interactions › Check two or more of your medications against each other Browse medications A–Z › Every drug we've checked against herbs & supplements NDC & pricing lookup › Find a drug’s NDCs, packaging and costs Ask a pharmacist › Free, personal answer from our licensed team