Sea Moss: A Nutritional Powerhouse or a Wellness Trend?

Sea Moss emerged into the wellness market five years ago, thanks to celebrities preaching about it and the COVID-19 pandemic, which left people desperately trying to consume anything and everything that may boost their immune systems. This seaweed has evolved into a cult-like wellness trend, with millions of people swearing it has transformed their health, skin, well-being, and life.

Is sea moss truly the miraculous superfood it's claimed to be, or just another wellness fad with limited evidence? Let's dive beneath the surface to separate fact from fiction.

What is sea moss?

Sea moss, sometimes called Irish sea moss or Chrondus crispus, is a type of seaweed in the red algae family. It grows in shallow coastal waters and can be found along the coasts of North America, Europe, and the British Isles. It is rich in antioxidants, nutrients, and minerals.

The trend of incorporating spoonfuls of sea moss into your morning routine began in 2020 when Kim Kardashian mentioned using it. Its popularity surged during the COVID-19 pandemic as many sought remedies to boost their immunity.

Today, sea moss is endorsed by various influencers and celebrities, evolving into a billion-dollar health trend. Numerous supplement companies have emerged, offering sea moss gels, capsules, and gummies. However, the use of sea moss dates back to the 1800s when it served as a vital nutritional source during the Irish potato famine, helping to prevent deficiencies.

Health benefits of sea moss

Let’s look at the potential health benefits of sea moss and what the science says about them.

Nutritional powerhouse

Irish sea moss contains 52.6% carbohydrates, 10–27% proteins, and 0.4–5.8% lipids. Like other seaweeds, it is rich in sodium, potassium, calcium, magnesium, iron, zinc, and iodine. It also contains vitamins A and C and various bioactive compounds: carrageenans, polyphenols, flavonoids, and mycosporine-like amino acids.

Sea moss’s nutritional profile is its main selling point. It is commonly claimed that a serving contains 99% of your daily essential nutrients. The issue with such nutritional claims is that sea moss is an unregulated supplement, and dietary values can vary vastly between brands or batches. Furthermore, the precise nutrient profile of seaweeds is influenced by sunshine, temperature, pH, and carbon dioxide in the water.

Another point is that despite sea moss's impressive nutritional profile, most people do not need that many nutrients from one product if they are eating a varied and healthy diet. And let’s be honest: most people who eat spoonfuls of sea moss are already eating healthy.

Lastly, if you are not deficient in iodine and take sea moss daily, you will likely have too much iodine in your diet, leading to iodine toxicity.

Antioxidants

Sea moss contains antioxidants and polyphenols, including flavonoids and tannins. An in vitro study showed that another type of red algae, Eucheuma cottonii, extract has significant antioxidant activity in mice.

Currently, no studies have investigated the antioxidant activity of sea moss in humans. Although chemical analysis shows that sea moss contains antioxidants, its bioavailability is unclear.

Digestive health

Sea moss contains fiber, which is a prebiotic and feeds the good gut bacteria; this, in turn, supports gut health and digestion. However, the gut health benefits of sea moss have not been studied in humans.

Also, eating too much sea moss may actually irritate the stomach. Furthermore, 40% of sea moss is carrageenan, a polysaccharide found in seaweeds, used as a thickener in the food and pharmaceutical industry. However, it has historically been used to induce intestinal ulceration in animal models and may increase intestinal permeability and gut inflammation in humans. Although it is generally considered a safe food additive, it is avoided by those with sensitive guts, making sea moss a questionable supplement for gut and digestive health.

Immune support

Sea moss is often praised for its immune-boosting properties, but scientific proof is lacking. Antioxidants, essential vitamins, and minerals all contribute to supporting the immune system, but the bioavailability and precise nutrient profile of sea moss can vary batch to batch and have yet to be studied in humans.

Other types of red algae have been shown to have anti-inflammatory effects in endothelial cells and to downregulate inflammatory markers in obese rats.

Skin health

Sea moss is praised for improving skin health and appearance. People are sharing before-and-after results, saying daily consumption of sea moss has cleared up their acne and drastically improved their skin health, complexion, and looks.

Antioxidants, along with nutrients such as vitamins A and C, and minerals like zinc and selenium, can play a significant role in maintaining skin health. Additionally, having a healthy gut supported by fiber is beneficial for the skin. However, there are currently no studies examining the effects of sea moss on skin health.

I know firsthand how tempting it can be to jump on board with taking supplements when struggling with stubborn acne after seeing impressive results in other people. Still, it is essential to remember that each case is individual. They could have drastically improved their diet and lifestyle while taking sea moss, skincare finally showed results, their hormones stabilized, and so on.

All in all, the health benefits of sea moss lack scientific studies. Chemical analysis and cell and animal studies do not necessarily translate to humans. So, sea moss has potential health benefits due to its nutritional profile, but it may also be no better than eating a varied and balanced diet.

At this point, I asked Ed McCorkmick, a Hydrocolloid (agar, pectin, carrageenan, xanthan, and similar) Expert, about the nutritional value of sea moss.

Mechanistically, the polysaccharides in sea moss behave like other hydrocolloids — supporting viscosity, potentially moderating post-meal glucose spikes, and feeding beneficial gut microbes. Antioxidant and immune claims show promise in lab or animal models, but large, well-controlled human trials are sparse. It’s reasonable as a fiber-rich food; it’s not a cure-all.

Ed McCorkmick

Safety risks and considerations

Before stocking up on sea moss, consider a few things carefully.

• Limited evidence. Most health effects have only been demonstrated in vitro or in animal models, which may not translate into human benefits.
• Variation in nutritional profile. The environment influences the amount of minerals and vitamins and can vary vastly batch to batch.
• Unclear bioavailability. There is a lack of studies on the bioavailability of sea moss. Just because something has nutrients, it does not mean we can absorb all of them.
• Heavy metals and pollutants. Sea moss, like most aquatic species, absorbs what is around it, including heavy metals and any contaminants present in water. While it goes through detox processes, not all heavy metals may be expelled during manufacturing, potentially causing heavy metal poisoning if consumed frequently.
• Expensive. Sea moss supplements are costly, unregulated, and their benefits are unproven.
• Iodine overload. Sea moss is very high in iodine, essential for thyroid function. However, consuming too much iodine can lead to an enlarged thyroid gland and other problems.
• Drug interactions. Sea moss has some anticoagulant properties and can negatively interact with blood-thinners.
• Gastrointestinal issues. More sensitive individuals or those with underlying gastrointestinal issues may experience stomach upset or exacerbation of symptoms after consuming sea moss.

If you still want to try sea moss, consult with your doctor first, especially if you have any diagnosed conditions, are pregnant, or are breastfeeding. Also, always choose products with third-party certification and reputable companies.

When asked if he would recommend sea moss for everyone, McCormick answered, “As a food ingredient, sea moss gel can be a sensible way to add fiber and texture; as a supplement, I’m cautious unless the brand publishes lab results and iodine levels.”

Bottom line

Sea moss has an impressive nutritional value on paper, but there are no studies on its bioavailability or the truth of the claims made by celebrities and wellness enthusiasts. The significant variability in product quality, potential contamination risks, and lack of human clinical trials raise serious doubts and concerns.

If you're curious about sea moss, consult with a healthcare provider before adding it to your routine, especially if you have existing health conditions. Choose products from reputable companies that provide third-party testing results, and remember that sea moss should complement, not replace, a nutrient-rich, varied diet.