Seaweed and kelp encompass a diverse group of marine algae — including nori, wakame, dulse, and spirulina — that have served as dietary staples in coastal cultures for centuries. Research suggests these sea vegetables offer an exceptionally dense nutritional profile, providing iodine, iron, calcium, magnesium, and a range of B vitamins alongside unique bioactive compounds like fucoidans and fucoxanthin. Studies indicate that certain seaweed polysaccharides may support gut health by acting as prebiotics, while their naturally occurring fiber and alginate content have been associated with improved satiety and modest benefits for blood sugar regulation. The iodine content in kelp varieties is particularly relevant to thyroid function, though concentrations can vary widely between species and sources, making awareness of intake an important consideration.
Compare this supplementResearch on seaweed and kelp as a source of antioxidant support in humans is not represented in the currently linked ...
View studies →Research on seaweed and kelp as they relate to gut health is very limited in the current evidence base, and the singl...
View studies →Research suggests that seaweed and kelp are recognized in nutritional science primarily as sources of iodine, with at...
View studies →Research suggests that the current published evidence directly examining seaweed or kelp as a tool for weight managem...
View studies →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Extract | 500–1,500 mg | Daily | blood sugar regulation and antioxidant support | Based on RCTs using fucoidan-rich brown algae extracts for glycemic outcomes |
| Extract | 400–800 mg | Daily | weight management and appetite regulation | Based on RCTs examining fucoxanthin-rich brown seaweed extracts |
| Powder | 500–1,000 mg | Daily | general nutritional support and iodine intake | Common in clinical and observational studies on seaweed supplementation |
| Powder | 1–4 g | Daily | gut health and prebiotic fiber support | Common in clinical trials examining alginate and polysaccharide effects on gut microbiota |
| Tablet | 200–600 mcg | Daily | thyroid health and iodine supplementation | Based on iodine content standardization in kelp tablets; clinical studies on thyroid function |