Seaweed海帶
Signature ingredient: Iodine — S-grade evidence (Goiter, ~533% of the studied dose per serving)
Standard nutrients per USDA FoodData Central · phytochemicals (lutein / K2 / sulforaphane etc.) are literature estimates, varying by variety and processing
S / A … ingredient evidence tier (tap for the claim) | bar = how much of the studied dose one serving of Seaweed gives you
High amount, but caveats a big number ≠ effective
Iodine
800ug · 533% DV
S Goiter →
＋ Cognitive Function A・Radioprotection A
Iodine content is very high and erratic; excess harms the thyroid; not advisable in large amounts daily
⚠Excess risk
Iron
2.8mg · 16% DV
⚠Poorly absorbed
Trace contribution far below the studied dose — not a therapeutic source
Why this page doesn't claim "Seaweed works"
Whole foods almost never have RCTs — the evidence sits on the ingredients. So this page does one honest thing: it lists which graded ingredients Seaweed contains, how much, and how far that is from the studied dose. It makes no efficacy claim about Seaweed itself.
Bottom line: Seaweed is a classic for iodine, but the problem isn't too little - it's too much: iodine content can reach several times the requirement and is erratic, and excess actually harms the thyroid. Eating it occasionally for iodine is fine; just don't have large amounts daily.
Every tier links to its full evidence page · Methodology →