The Tamesis
Before sea moss became a superfood recognized by everyone from Erewhon to Bella Hadid, it was a centuries-old energizing remedy. Originating from Ireland and the Caribbean coast, sea moss gel was harvested by coastal dwellers for its benefits long before it became popular in the wellness world. Early herbalists used it to prevent scurvy, and later it was used as a food source due to its high nutrient density. Some cultures even use the gel as a libido enhancer.
As with many traditional medicines, historically there has been little clinical research to support these well-known health claims. In recent years, however, research has begun to investigate the properties of sea moss, revealing its antiviral, anti-inflammatory, and anti-tumor potential.
Science does know that seaweed contains dozens of essential nutrients, vitamins and minerals, including magnesium and vitamin C. “Seaweed is popular in large part because it is rich in trace minerals, especially iodine, which is critical for healthy thyroid function,” confirms board-certified endocrinologist Dr. Jolene Brighten. “The thyroid uses iodine to produce thyroid hormones, which regulate metabolism, energy, mood, and even menstrual regularity.” Iodine also plays an important role in immunity, and combined with other nutrients in seaweed, can help strengthen your defenses.
Read on for our guide to the best sea moss supplements we’ve tried and their benefits, plus expert advice on how best to use them.
What is seaweed used for?
Sea moss is rich in mucilage (a sticky substance produced by plants) that soothes irritated mucous membranes in the respiratory tract. It may be beneficial during flu season due to its antibacterial properties and potassium chloride content that helps break up phlegm.
Seaweed’s high fiber content may also help improve digestion. Emerging research shows that it is rich in prebiotics and may support a healthy gut microbiome.
Sea moss is rich in lipids, antioxidants, and vitamins A, C, and E, making it ideal for topical application to the skin. Used as a mask, it hydrates and calms inflammation; when ingested, its high vitamin C content helps support healthy collagen production.
Sea moss contains iron and magnesium, both of which help fight fatigue.
Does seaweed really work?
There is plenty of anecdotal evidence that sea moss has health benefits. However, studies validating these claims are limited when it comes to replicable clinical trials. So far, research supporting its medicinal uses is preliminary.
Dr. Jolene Brighten adds that the mineral content of sea moss varies widely depending on species and growing conditions, making consistent dosing difficult. Since supplements are rarely standardized, it’s important to note that results may vary from brand to brand.
“Despite advertising by several suppliers of sea moss products, there are no scientific studies (on PubMed, the federal source of published scientific work) claiming any effect on blood pressure or cardiovascular health,” noted Dr. Ernst von Schwarz, a cardiologist and professor of clinical medicine at UCLA. “Therefore, it may be worthwhile and timely to study the effects of sea moss on the vascular system.”
Who should not use seaweed?
Dr. von Schwartz says that because of the iodine content in seaweed, people with thyroid disease, especially those with hyperthyroidism, should avoid eating seaweed. Even healthy people should avoid excessive consumption. Dr. Brighten agrees: “More is not always better, especially when it comes to iodine. Excessive iodine intake can actually disrupt thyroid function, especially in patients with autoimmune thyroid diseases like Hashimoto’s or Graves’ disease.”
If you are pregnant or allergic to seafood, it is not recommended to eat seaweed. Always consult your doctor for the best medical advice when introducing supplements, especially if you are taking any other prescription medications.
What to look for in a good seaweed supplement
Wild-harvested sea moss gels from protected or pristine waters are the best form to buy because they are likely to be free of additives and contaminants. They also retain the full nutritional profile of the algae and trace minerals from the ocean of their origin. These gels are also generally better absorbed by the body.
Pool-grown or cultured sea moss is generally cheaper because it can be produced in large quantities year-round in a controlled environment. However, these options do not grow with access to ocean minerals and may be processed with additives.
“Some authors are concerned about the possibility of heavy metal contamination,” says Dr. von Schwartz, a common complaint among some powdered supplements. If you prefer to purchase seaweed powder or capsules, look for dried seaweed that has been independently tested for safety and purity. Avoid formulas from unknown sources or formulas that have preservatives and artificial fillers added to the mix.
Meet the experts:
- Dr. Ernst von Schwarz, MD, PhD, is a cardiologist and clinical professor of medicine at UCLA and the author of hundreds of scientific papers in international medical journals.
- Dr. Jolene Brighten is a board-certified endocrinologist and expert author of several books on female hormonal health.
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