Sea Moss
Also known as: irish moss, chondrus crispus, carrageenan, sea moss gel
Recommended Dosage
1000–3000 mg
Sea moss (Chondrus crispus, Irish moss) is a red algae rich in minerals — particularly iodine, potassium, and calcium — and contains carrageenan, a polysaccharide with prebiotic properties. While traditional use spans centuries in coastal cultures, rigorous clinical trial evidence is limited compared to other supplements. The primary evidence-based benefit is as a natural iodine source for thyroid support, though its mineral density and prebiotic fiber content provide general nutritional value.
TL;DR: Mineral-rich seaweed popular for its 92-mineral profile. Prebiotic fiber supports gut health. Limited clinical trial evidence despite popularity — most claims extrapolated from nutrient analysis. Iodine content requires caution.
Quick Facts
Evidence
Grade C
Studies
2
Interactions
2
Forms
1
Evidence Rating: Grade C — Preliminary
Limited human trials, mostly animal or in-vitro data. Promising but not yet proven in robust human studies.
Interaction Warnings
Very high iodine content can dramatically affect thyroid function — avoid with thyroid disorders or thyroid medications without monitoring.
Carrageenan may have mild anticoagulant properties.
Important Notes
- Extremely high in iodine — can cause thyroid dysfunction if consumed in excess
- Quality varies enormously — heavy metal contamination is possible
- Popularity outpaces clinical evidence — most claims are based on nutrient content, not clinical trials
- Carrageenan (degraded form) has GI irritant concerns — whole sea moss is different
Clinical Evidence (2 studies)
Nutritional profile of Irish moss (Chondrus crispus)
Pereira L (2018) — Mar Drugs
Sea moss contains 92 of the 102 minerals the body uses, including significant iodine, potassium, calcium, and sulfur compounds
View on PubMedSeaweed bioactives and gut health
Cherry P et al. (2019) — Mar Drugs
Seaweed polysaccharides act as prebiotics, promote beneficial gut bacteria growth, and modulate immune response
View on PubMedAlternatives to Consider
These supplements target similar goals and may be worth considering alongside or instead of Sea Moss.
Zinc
Grade AEssential mineral for immune function, wound healing, and testosterone production. Lozenges reduce cold duration by ~33%.
Selenium
Grade BEssential trace mineral for thyroid function (T4→T3 conversion) and antioxidant defense. Reduces Hashimoto's antibodies.
Iron
Grade AEssential for oxygen transport and energy. ONLY supplement if deficient — excess iron is a pro-oxidant. Bisglycinate form preferred.
Related Supplements
Black Seed Oil
Grade B — Moderate EvidenceWidely studied traditional remedy with strong anti-inflammatory properties from thymoquinone. Evidence for metabolic health, immune modulation, and gut health. Oil form preferred for absorption.
Zinc
Grade A — Strong EvidenceEssential mineral for immune function, wound healing, and testosterone production. Lozenges reduce cold duration by ~33%.
Selenium
Grade B — Moderate EvidenceEssential trace mineral for thyroid function (T4→T3 conversion) and antioxidant defense. Reduces Hashimoto's antibodies.
NAC (N-Acetyl Cysteine)
Grade B — Moderate EvidencePrecursor to glutathione (master antioxidant). Strong evidence for respiratory health, liver support, and psychiatric conditions.
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⚕️ Important Disclaimer
This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.
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