Bladderwrack (Thyroid Support)
A seaweed rich in natural iodine traditionally used to support thyroid function.
Also known as: Fucus vesiculosus • Kelp • Sea Oak
Overview
Bladderwrack (Fucus vesiculosus) is a brown seaweed that has been used for centuries as a natural source of iodine for thyroid support. It also contains fucoidan, alginic acid, and other bioactive compounds with anti-inflammatory and antioxidant properties. As a whole-food iodine source, it provides iodine in a matrix of cofactors.
Key Benefits
Natural Iodine Source
Provides iodine in a whole-food matrix with cofactors for thyroid function.
Thyroid Support
Traditional use for supporting underactive thyroid; provides raw material for hormone synthesis.
Mineral Rich
Contains trace minerals including selenium, zinc, and manganese.
Fucoidan Content
Bioactive polysaccharide with anti-inflammatory and immune-modulating properties.
Dosage & How to Take
500-1000 mg daily with known iodine content.
| Purpose | Dose | Notes |
|---|---|---|
| Mild thyroid support | 500 mg/day | Check iodine content on label |
| Moderate support | 500-1000 mg/day | Do not exceed 1100 mcg iodine/day |
Best Time to Take
With food.
With or Without Food
Yes, with food.
Forms & Bioavailability
| Form | Absorption | Best For | Notes |
|---|---|---|---|
| Standardized Capsules | Good | Known iodine content | Look for iodine content on label. |
| Dried Seaweed | Variable | Dietary use | Iodine content varies widely. |
Side Effects & Safety
Common
- GI discomfort
- Metallic taste
Rare
- Thyroid dysfunction from excess iodine
- Heavy metal contamination
Contraindications
- Hyperthyroidism
- Hashimoto's (without selenium)
- Iodine allergy
Interactions
Iodine content may alter thyroid hormone levels.
Fucoidan may have anticoagulant effects.
Scientific Research
Seaweed and thyroid function
Studies confirm seaweed consumption effectively increases iodine status, but excess intake can cause thyroid dysfunction.
Food Sources
Frequently Asked Questions
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you have pre-existing health conditions or are taking medications. The statements on this page have not been evaluated by the Food and Drug Administration.