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Sea Moss Powder (Chondrus crispus)

Also known as: Irish moss, Chondrus crispus, Carrageenan moss, Sea moss extract

C
Evidence

Sea moss is a nutrient-dense red algae containing minerals (iodine, potassium, calcium), polysaccharides, and carrageenan. Limited human clinical evidence exists; most claims are based on traditional use and in vitro studies.

Primary uses

  • Nutritional supplementation
  • Iodine source
  • Joint and skin health
  • Digestive support
  • Thyroid support

How it works

  • Provides bioavailable minerals (iodine, potassium, magnesium, calcium)
  • Polysaccharides may support gut microbiome
  • Carrageenan may have demulcent properties in GI tract

Dosage

Typical range
1-5 grams daily (or 1-2 capsules, 400-500 mg each)
Timing
Can be taken anytime; often added to smoothies or taken with meals
With food
No specific requirement; may be taken with or without food
Duration
Typically used long-term as a nutritional supplement; no established duration limits
Special populations
Pregnant/nursing women should consult provider (iodine levels); those with iodine sensitivity or thyroid conditions requiring iodine restriction should use cautiously

Forms

  • Powder· 70/100
  • Capsules· 70/100
  • Gels· 70/100

Safety

Common side effects

  • Generally well-tolerated
  • Potential GI effects (digestive upset, bloating) if sensitive to polysaccharides
  • Iodine-related effects in excessive amounts (rare at typical doses)

Contraindications

  • Hyperthyroidism or conditions requiring iodine restriction (use cautiously)
  • Kelp/iodine allergy
  • Heavy metal contamination in some batches; sourcing matters

Evidence notes

Limited human RCT data. Traditional use is well-established, and mineral composition is well-documented. However, specific bioavailability, efficacy for claimed uses, and safety in supplement form require more rigorous clinical evidence.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.