Sea moss is everywhere right now. TikTok creators call it a “superfood” that can improve gut health, support the thyroid, boost immunity, and more. While interest in sea moss has surged on social media, it’s not a new wellness trend—it’s long been used throughout the Caribbean, where it has deep cultural roots.
But do the health claims about sea moss hold up?We spoke with registered dietitians and reviewed the research to separate fact from fiction. Here’s what experts say about five of the most common sea moss benefits you’ll see online—and whether they’re backed by evidence.
What is sea moss?
Sea moss is a type of red algae that grows along the Atlantic coasts of Europe, North America, and the Caribbean. Rich in naturally occurring minerals, it’s long been used in Caribbean cuisine and traditional wellness practices.
Krystal George, R.D.N., a registered dietitian with a family heritage from the Caribbean, says that traditionally, sea moss is consumed in a sweet drink, used as a thickener in soups and stews, or taken by the spoonful for its health benefits. In the U.S., it’s sold as a supplement in gummy or capsule form or as a premade gel that’s ready to be added to smoothies, yogurt, oatmeal, or other foods.
Can sea moss improve gut health?
One of the major claims about sea moss is that it supports gut health and can even heal the gut. “There is some truth here, but it’s easy to overstate,” says Jamie Schwartz, R.D., a registered dietitian and founder of Appetite For Life Nutrition. Schwartz explains that sea moss contains carrageenan and other polysaccharides that act as prebiotics, meaning they can feed beneficial gut bacteria. It also has a gel-like, soluble fiber quality that may help with regularity and stool consistency.
But she emphasizes that no robust scientific studies show that sea moss can “heal” the gut. “The effect, if real, is modest and not the dramatic ‘gut reset’ influencers often claim,” she says.
Registered dietitian Mackenzie Mitchel, R.D., also says that there is a lack of scientific research in this area and the claims are likely overblown. That doesn’t mean there isn’t a gut health benefit; like Schwartz, Mitchel says that the prebiotic fiber in sea moss nourishes good gut bacteria. But the RDs we spoke with say it’s unlikely to lead to a major, noticeable benefit for digestive health.
“Sea moss is often marketed as a gut-healing superfood, but there have not been enough human studies to confirm that it actually improves gut health in the ways people claim,” sums up registered dietitian Jill McNutt, R.D.N.
Does sea moss support thyroid health?
McNutt explains that sea moss is rich in iodine, which supports thyroid health. This is why you’ll see TikTok videos claiming that sea moss can help with thyroid-related issues such as weight gain, fatigue, depression, hair loss, and dry skin. If you have low iodine levels, McNutt says upping your intake (through sea moss or other sources) can help. But more isn’t always better.
“Most adults need about 150 micrograms of iodine per day, and consuming too much iodine can negatively affect thyroid function. Both iodine deficiency and excess intake may contribute to thyroid disorders like hypothyroidism or hyperthyroidism, so it’s important to aim for a balanced intake,” she says.
George adds that iodine deficiency is rare in the U.S. and that excessive iodine intake can be dangerous—a risk Schwartz also highlights as one of the main concerns associated with consuming sea moss.
imageBROKER/Katerina Solovyeva – Getty Images
(imageBROKER/Katerina Solovyeva – Getty Images)Can sea moss boost immunity?
All six dietitians we spoke with say sea moss contains many nutrients that support immune health, including zinc, selenium, and antioxidants. Registered dietitian Laurie Thenedy, R.D., says that sea moss contains magnesium, which helps lower oxidative stress and inflammation. “It’s also a ‘helper’ to activate vitamin D absorption, which is a necessary vitamin for immune function,” she says. On top of all these nutrients, George points out that the majority of the immune system is found in the gut, so the prebiotic fiber in sea moss is one way it may support immune health.
While all these nutrients contribute to immune function, registered dietitian Maggie Michalczyk, R.D., says that research on sea moss and immune health is still emerging, and no human clinical trials have shown that sea moss prevents illness or drastically boosts the immune system.
Does sea moss help with weight loss?
Sorry, but sea moss alone is unlikely to have a significant impact on weight loss. “It may aid in weight loss, but it shouldn’t be used solely for weight loss,” George says.
However, its soluble fiber may offer some support. George explains that this fiber forms a gel in the gut, which can help you feel fuller for longer and potentially reduce overall calorie intake.
Is sea moss good for heart health?
Thenedy says that many of the nutrients in sea moss (including magnesium, calcium, vitamin B12, and fiber) are good for cardiovascular health. But again, you’re not going to experience a major change in your blood pressure or cholesterol simply by incorporating sea moss into your diet.
The dietitians we spoke with say that overall dietary patterns matter more for heart health, emphasizing a diet rich in vegetables, fruits, whole grains, plant-based proteins, lean animal proteins, and seafood.
What to know before trying sea moss
With all this in mind, all the dietitians we spoke with say the health benefits of sea moss are largely overblown. While it may play a small supportive role in health, it isn’t the superfood many claim it is.
Still want to give it a try? Sea moss is typically sold as a gel, which is how George says it’s best consumed. It’s made by soaking dried sea moss overnight, then rinsing to remove excess sand and salt. Then it’s blended with water, which creates the gel. “Most people will keep it in an airtight container and refrigerate it in the coldest part of the fridge for safekeeping. It typically lasts in the fridge for three to five days,” she says.
But when shopping for sea moss, Schwartz says to look for sea moss supplements that are third-party tested for purity, potency, and safety. This is especially important because the presence of heavy metals is one of the primary risks of consuming sea moss. “Sea moss bioaccumulates arsenic, lead, and mercury from ocean water,” Schwartz says, adding that the ingredient list should be minimal and list only sea moss and water.
The bottom line: Is sea moss worth trying?
“Sea moss is not a scam, but it is significantly overhyped,” Schwartz says, a sentiment that the other dietitians echoed. While it does have nutrient value, Schwartz says that there are very real risks to consuming it, specifically iodine excess and heavy metal contamination. “For most people eating a balanced diet, sea moss will be a low-risk, low-reward addition. It’s not going to transform your health, but consumed mindfully and from a quality source, it’s unlikely to hurt,” Schwartz says.
With all this in mind, sea moss is one social media trend you can safely skip.
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