Kelp: benefits by goal, the dosage that worked, and the supplements ranked
What the 31 human studies of kelp we graded show for each goal, the dose that worked, and the products that hold it. This page is educational, not medical advice.
Kelp benefits, by goal: what the studies show
Members OnlyThe top 1 of 1 goals
| Goal | What the studies show | Studies | Dose that worked |
|---|---|---|---|
| Thyroid Health | No effect in studies 31 studies, 1 showed an improvement, 11 found none, 1 pooled analysis | 31 | – |
Kelp supplements, ranked by the human studies
Members OnlyThe top 1 of 1
Kelp dosage: how much per day
The dose that worked in the studies, and the upper limit
No study we graded gave a dose that worked yet.
Biohacker panel
Members OnlyWhat our 10 biohackers say about kelp
Peter Attia, 28 Sep 2026, a caution: Warns that kelp and other iodine-rich seaweeds in supplements can independently trigger hyperthyroidism in people with an undiagnosed autonomous nodule by forcing iodine into the system. Source
Ben Greenfield, 23 May 2026, a caution: Advises caution with kelp and high iodine seaweeds for individuals with autoimmune thyroid disease. Source
Dave Asprey, 9 Apr 2026: Mentions kelp as a source of iodine, but notes that 2,000 micrograms a day would require many pills. Source
Thomas DeLauer, 29 Aug 2025: Recommends kelp as a source of iodine to support thyroid function. Source
Dr. Eric Berg, 22 Jun 2025: Recommends taking kelp because of its iodine content, which helps reduce estrogen, a factor in fibrocystic breast problems. Source
Andrew Huberman, 14 Mar 2022: Mentions that some people might want to ingest kelp for iodine intake, while others might not, advising listeners to consult a previous episode for more information. Source
Questions people ask
Members OnlyAnswered from the figures on this page
Can I take kelp with my meds?
Some supplements can change how meds work or are absorbed. Members have every product checked against the meds in their Health Profile before it joins their protocol.
Educational, not medical advice. Figures come from the human studies on PubMed we have graded; a study counts for a form when it names the form it used. Updated as new studies arrive. How we grade →
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