1Systematic Review2022
Lee IS, Ko SJ, Lee YN, Lee G, Rahman H, Kim B · Nutrients (2022)
No plain-language summary recorded for this citation — open the paper to read its abstract.
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19 peer-reviewed studies
What the evidence says
Kelp doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality randomised trials published 2003–2026 with a typical study size of 1 participants.
Based on 19 studies · 12 RCTs · 46 total participants
Confidence
Moderate confidenceBy outcome
6 studies in the last 5 years
Lee IS, Ko SJ, Lee YN, Lee G, Rahman H, Kim B · Nutrients (2022)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Odunsi ST, Vázquez-Roque MI, Camilleri M, Papathanasopoulos A, Clark MM, Wodrich L · Obesity (Silver Spring) (2010)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Paradis ME, Couture P, Lamarche B · Appl Physiol Nutr Metab (2011)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Clark CD, Bassett B, Burge MR · Endocr Pract (2003)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Aoe S, Yamanaka C, Ohtoshi H, Nakamura F, Fujiwara S · Mar Drugs (2021)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Nishiumi S, Izumi Y, Kobayashi T, Yoshida M · J Nutr Sci Vitaminol (Tokyo) (2020)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Kang YM, Lee BJ, Kim JI, Nam BH, Cha JY, Kim YM · Food Chem Toxicol (2012)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Reid SNS, Ryu JK, Kim Y, Jeon BH · Evid Based Complement Alternat Med (2018)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Vodouhè M, Marois J, Guay V, Leblanc N, Weisnagel SJ, Bilodeau JF · Mar Drugs (2022)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Murray M, Dordevic AL, Cox KHM, Scholey A, Ryan L, Bonham MP · BMJ Open (2018)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Dashkevich OV, Nizov AA, Lapkin MM, Trutneva EA, Abramova LS, Petrukhanova AV · Vopr Pitan (2013)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Ren R, Azuma Y, Ojima T, Hashimoto T, Mizuno M, Nishitani Y · Br J Nutr (2013)
No plain-language summary recorded for this citation — open the paper to read its abstract.
Derosa G, Cicero AFG, D'Angelo A, Maffioli P · Phytother Res (2019)
No plain-language summary recorded for this citation — open the paper to read its abstract.
In plain English: Population-based solutions would correct iodine status efficiently and align the UK with other high-income countries.
Taylor PN, Prentice M, Bath S, Combet E, Schoenmakers N, Smith VE, Gibb FW, Zammitt N, Okosieme O, Boelaert K, Lazarus J, Vanderpump M. · Clinical endocrinology (2026)
In plain English: This review comprehensively examines current advancements in fucoidan extraction and purification techniques, discusses its structural characterization, and synthesizes recent findings on its multifaceted biological activities to explore its potential and significance in human health.
Wan H, Zhang YX, Gao ZC, Shan GY, Liu F, Li HJ. · International journal of biological macromolecules (2025)
In plain English: This study found excessive iodine status in macroalgae consumers, and consumers should be made aware of the risk associated with including seaweed in their diet.
Aakre I, Tveito Evensen L, Kjellevold M, et al. · Nutrients (2020)
In plain English: Iodine intake came predominantly from iodized salt, with kelp and seaweed contributing only a minor share of total dietary iodine.
Wu H, Meng S, Sun D, et al. · Front Endocrinol (Lausanne) (2025)
In plain English: Eight of nine randomly obtained commercial kelp samples showed arsenic above the FDA tolerance level, and a patient's symptoms resolved after discontinuing her kelp supplement.
Amster E, Tiwary A, Schenker MB. · Environ Health Perspect (2007)
In plain English: Physicians should advise patients with underlying thyroid disease to avoid all complementary or alternative medications containing iodine.
Müssig K, Thamer C, Bares R, Lipp HP, Häring HU, Gallwitz B. · J Gen Intern Med (2006)