“Laminara?”Here!kelp (Laminaria species)
Hasn’t appeared in a scanned product yet.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
A brown seaweed used as a food and supplement ingredient, most often as a natural source of iodine.
Why it’s used
Taken as a source of dietary iodine or as a general marine-derived nutrient ingredient.
What the evidence says
Iodine's role in thyroid function is well established, but the iodine content of kelp products varies widely and is often unlabeled or inconsistent between batches, which limits what can be said about this specific ingredient's effects at any given dose. Dedicated clinical research on Laminaria itself, apart from its iodine content, is sparse.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 220 records · searched September 2026
"Laminaria"[Title/Abstract] AND (review[pt] OR "safety assessment"[Title/Abstract] OR "risk assessment"[Title/Abstract] OR toxicology[Title/Abstract] OR toxicity[Title/Abstract] OR characterization[Title/Abstract] OR characterisation[Title/Abstract]) - PubMed: 8 records · searched September 2026
"Laminaria"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 1647 records · searched September 2026
"Laminaria"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
No standardized dosing protocol for Laminaria exists in the research literature, largely because its iodine content is not consistently measured or reported across studies and products.
Rumors
Kelp supplements boost the immune system.
Not gradedhealth and safety evidence
Sources cited — no verdict reached.
What was measured is not yet noted.
- Brown Seaweed Food Supplementation: Effects on Allergy and Inflammation and Its Consequences (Peer-reviewed) · Funded by Health Holland (HHINT Kickstarter #LSH17004), Alzheimer Nederland (WE.03-2018-06 AN) and NWO-TTW (#16437) (government) · Authors declare a conflict of interest
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 can be 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)