Also known as: Fucus vesiculosus, Kelp, Rockweed, Black tang
Iodine-rich seaweed traditionally used for thyroid support, but dose is highly variable.
Monitor thyroid if using long-term
Those seeking natural iodine source
We haven’t curated landmark studies for Bladderwrackyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Variable iodine content makes dosing unreliable
Avoid (unpredictable iodine)
Watch for heavy metals
Formulate Research Team. (2026, August). Bladderwrack — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/bladderwrack
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.