What is Irish moss (seaweed)?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: May 18, 2025View editorial policy

Personalize

Help us tailor your experience

Which best describes you? Your choice helps us use language that's most understandable for you.

From the Guidelines

Sea moss, a type of red algae, is a rich source of iodine and other minerals, but its consumption should be approached with caution due to the potential risk of excessive iodine intake. According to a 2018 study published in the Proceedings of the Nutrition Society 1, seaweed, including sea moss, can have a very broad range of iodine levels, from 11 to 6118 µg/g of dried seaweed, which could lead to an iodine excess beyond the European tolerable upper limit of 600 µg daily. Some key points to consider when consuming sea moss include:

  • Iodine content: Sea moss is a rich source of iodine, with potential benefits for thyroid support, but excessive consumption can cause thyroid issues 1.
  • Dosage: Typical consumption includes 1-2 tablespoons of sea moss gel daily, 1000-1500mg daily in capsule form, or added to smoothies.
  • Preparation: The gel is made by soaking dried sea moss in water, blending it, and refrigerating until it thickens.
  • Potential benefits: Thyroid support, immune system enhancement, digestive health improvement, and skin hydration.
  • Precautions: Those with thyroid conditions or taking blood-thinning medications should consult a healthcare provider before using sea moss due to the potential risks associated with excessive iodine intake 1.

From the Research

Definition of Seamoss

  • Seamoss, also known as seaweed, is a marine aquatic vegetable that is rich in nutrients 2.
  • It has a natural and sustainable origin and can come from marine aquaculture or controlled fisheries.

Nutritional Value

  • Seamoss has high nutritional value as a source of polyunsaturated fatty acids, proteins, carbohydrates, vitamins, and especially minerals 2.
  • It is known for its high mineral content, which is gathered from seawater depending on the seasonal variation and the environment.
  • The mineral content of seamoss is at least 10 times higher than terrestrial plants and can reach 20-50% of its dry weight.

Health Benefits

  • Seamoss can make an important contribution to the daily intake of minerals and is a promising source of essential minerals for functional food, food supplements, and nutraceuticals 2.
  • Omega-3 fatty acids found in seamoss have been shown to reduce the risk of coronary artery disease death and have antiatherosclerotic and antithrombotic effects 3, 4.

References

Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

Research

Minerals in edible seaweed: health benefits and food safety issues.

Critical reviews in food science and nutrition, 2022

Research

Antiatherosclerotic and antithrombotic effects of omega-3 fatty acids.

The American journal of cardiology, 2006

Research

Omega-3 fatty acids, cardiovascular risk, and the resolution of inflammation.

FASEB journal : official publication of the Federation of American Societies for Experimental Biology, 2019

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.