“Laminaria?”Here!kelp
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As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
A genus of large brown seaweed harvested and dried for use in food and supplements, typically valued as a natural source of iodine and other minerals.
Why it’s used
Taken as a mineral source, particularly for iodine, and sometimes marketed loosely in connection with thyroid or metabolic support.
What the evidence says
NIH ODS discusses iodine's established role in thyroid hormone production and the risks of both deficiency and excess, but seaweed-specific iodine content is highly variable and often unlabeled precisely, making dosing from Laminaria itself hard to characterize. Direct evidence for Laminaria as a supplement ingredient, beyond its iodine contribution, is thin.
Context
Iodine content in kelp products has been shown in testing to vary widely between batches and brands, a variability noted in regulatory and academic surveys rather than in a single dosing protocol.
Rumors
Kelp supplements improve thyroid function and boost the immune system.
Does not support — suggestivehealth and safety evidence
Studied in: Japanese adults (healthy/overweight) consuming kelp or kombu supplements.
Measured as a biomarker.
- Effects of Daily Kelp (Laminaria japonica) Intake on Body Composition, Serum Lipid Levels, and Thyroid Hormone Levels in Healthy Japanese Adults: A Randomized, Double-Blind Study (Peer-reviewed) · Funded by Hokkaido Fisheries Corporative Associations (industry) · Authors declare a conflict of interest
- Suppression of Thyroid Function during Ingestion of Seaweed "Kombu" (Laminaria japonoca) in Normal Japanese Adults (Peer-reviewed) · Funding not checked
Who’s saying this
- Walmart — a retailer: sells fashion, home goods and more; Walmart+ membership
How we know who this is
- “The trademarks Walmart and the Walmart Spark design are registered with the US Patent and Trademark Office.” (their page)
- “Annual members can save $380 per year!” (their page)
Kelp supplements help weight loss by stimulating the thyroid and boosting metabolism.
Does not support — suggestivehealth and safety evidence
Studied in: overweight Japanese adults (BMI 25-30).
Measured as a biomarker.
- Effects of Daily Kelp (Laminaria japonica) Intake on Body Composition, Serum Lipid Levels, and Thyroid Hormone Levels in Healthy Japanese Adults: A Randomized, Double-Blind Study (Peer-reviewed) · Funded by Hokkaido Fisheries Corporative Associations (industry) · Authors declare a conflict of interest
- The Effect of Laminaria japonica on Metabolic Syndrome: A Systematic Review of Its Efficacy and Mechanism of Action (Peer-reviewed) · Funding not checked
Who’s saying this
- Global Healing — a brand: sells natural vitamins, minerals, herbal supplements, skincare and detox protocols
How we know who this is
- “Global Healing is here to guide your journey to whole-body wellness with natural vitamins, minerals, herbal supplements, skincare, and detox protocols.” (their page)
Kelp in supplements causes thyroid dysfunction, including hyperthyroidism, through iodine overload.
Supports — suggestivehealth and safety evidence
Measured as an outcome.
- Thyroid dysfunction following a kelp-containing marketed diet (Peer-reviewed) · Funding not checked
- Commercially available kelp and seaweed products – valuable iodine source or risk of excess intake? (Peer-reviewed) · Funded by Institute of Marine Research (government) · No conflicts declared
Who’s saying this
- Ubie — a brand: AI symptom checker; sells targeted healthcare advertising to pharma advertisers
How we know who this is
- “Ubie is Japan's top healthcare startup.” (their page)
- “Ubie launches a self-serve platform that lets healthcare and pharma advertisers reach patients with targeted, clinically contextual placements inside Ubie's AI-driven patient experiences.” (their page)
Kelp supplements are contaminated with arsenic, a toxic heavy metal.
Does not support — suggestivehealth and safety evidence
Measured as a biomarker.
- Organic versus Inorganic Arsenic in Herbal Kelp Supplements (Peer-reviewed) · Funding not checked
Who’s saying this
- ConsumerLab.com, LLC — a publisher: sells memberships to supplement test results; also earns certification and seal-licensing fees
How we know who this is
- “ConsumerLab.com, LLC is a privately held company based in New York.” (their page)
- “Revenues are also derived from Quality Certification Program fees, authorized use of the CL Seal of Approval, and sales of survey reports.” (their page)