Men's Health October 2, 2026 0 Comments

Is Irish Sea Moss the Secret Superfood Everyone’s Obsessing Over—Or Just Another Health Fad?

Every now and then, a new health craze sneaks up on us, making big promises and skyrocketing to fame quicker than you can say “superfood.” Irish Sea moss is one of those trends that’s stuck around — showing up in smoothies, supplements, and even beauty routines, with claims of revving up your immunity and beautifying skin and hair. But here’s the real question: Is this seaweed superstar genuinely the health hack it’s cracked up to be, or just a neat way to lighten your wallet? As someone who’s sifted through countless health fads (and trust me, I’ve seen a few flops), I’m diving into the science, the hype, and the risks to give you the lowdown on Irish Sea moss. Ready to find out if it’s worth the buzz? LEARN MORE

5 min read

EVERY ONCE IN a while, another wild health trend hits mainstream popularity that makes you wonder, “can this really make me healthy?”

Some of these fads fade away after a few months. Others have more staying power like Irish Sea moss. Advertisements boast that the plant helps support healthy joints, skin, and hair, as well as acting as an immunity booster. Celebrities and content creators continue to show it off as another fixture in their wellness routine. As people turn toward more plant-based supplements, the global sea moss market is estimated to increase to about 3.99 billion in 2030.

Let’s look at the facts. “Irish Sea moss is a type of seaweed or algae that contains vitamins, minerals, and antioxidants,” says Johna Burdeos, RD, a registered dietitian. “In particular, it supplies iodine, iron, magnesium, phosphorus, zinc, and copper.”

You need all the aforementioned nutrients in your body. While you can technically get all of these in foods, a scoop of Irish Sea moss in a smoothie seems like a health hack for optimizing your health. But does it truly have health benefits or is it a way to bait you into parting with your money? We investigated.

First, What Is Irish Sea Moss?

SEA MOSS COMES in two forms: Irish Sea moss or red seaweed. It’s found in the Atlantic Ocean, along the coasts of the United States, Canada, and well, Ireland. It is often harvested in New England.

“Sea moss comes in different colors such as green, yellow, red, and purple. Irish Sea moss is a species of the red algae family,” says Burdeos. It is also known as carrageenan moss and Chondrus crispus. Sea moss comes in powders, pills, dried flakes, and even gummies. People add it to almost everything—puddings, ice cream, and even toothpaste. Irish Sea moss also has properties that make it useful in preservatives, Burdeos says.

What Are the Benefits of Irish Sea Moss?

SCIENCE HAS A long way to go to catch up with the health halo hype that you see associated with Irish Sea moss.

“There are not many studies showing the effects of sea moss on human health,” says Burdeos. Extracts of Chondrus crispus have shown potential for antioxidant and anti-inflammatory activity. One important point to make is that most of the existing studies on humans are small and other studies have been done on animals and in vitro, meaning in a test tube or culture dish—nowhere near the level of testing needed to see results in humans.

Now there are more studies on seaweed in general than there are specifically on Irish Sea moss. Why is that important? Well, think of seaweed as a super-close cousin to Irish Sea moss. People selling Irish Sea moss tend to reference the benefits of seaweed and apply it to Irish Sea moss. For example, seaweed has been shown to support gut health because of its fiber content. The iodine content in seaweed has also been linked to a modest reduction in heart disease risk and thyroid issues.

The bottom line is there’s no scientific research to support that Irish Sea moss supplements would have a guaranteed benefit to your health, though it could technically have some vitamins and minerals your body needs. Even then that varies (more on that below).

What Are the Risks of Taking Irish Sea Moss?

REMEMBER HOW PEOPLE like to extrapolate the health benefits of seaweed and apply it to Irish Sea moss? Well, the same goes for its risks. Because again, seaweed has more research behind its claims and the makeup is essentially the same as Irish Sea moss.

There are potential risks with having too much seaweed, though not very likely. Seaweed is a great source of iodine, a mineral our bodies need to survive. Too much iodine is harmful to thyroid health, but take a look at what that really means: The NIH recommends about 150 mcg daily and one serving of seaweed has about 116 mcg. You would need to consume over 1.1 milligrams per day to develop iodine toxicity. There’s also the risk of heavy metals.

“Seaweed can absorb heavy metals from the waters where it grows,” says Burdeos. “Heavy metals consumed in large amounts can result in neurological, kidney, liver, and heart damage as well as cancer. It’s important to note that the nutrient content in sea moss (and seaweed in general) can vary due to the seasonality and ecology of the harvesting location.” Most serving sizes fall below contaminant levels, but the problem is when you consume large amounts—or take a supplement that could have higher amounts of them.

The FDA has food safety policies for companies to check for heavy metals in foods, but there’s technically no universal heavy-metal limit for edible seaweed. And certain supplements have been accused in the past of heavy metal contamination. In other words, you will need to do your own research to make sure the product you’re buying is safe. You can typically find this information on the packaging or on its website.

Should I Be Taking an Irish Sea Moss Supplement?

YOU REALLY DON’T need it. There’s no such thing as being “deficient” in Irish Sea moss, though you may be deficient in some of the nutrients it provides, like iodine and magnesium. If you aren’t meeting the requirements for those nutrients, talk to a doctor for your next course of action. Most likely, they’ll point you to food sources high in magnesium or iodine.

“If you are already eating a varied diet that includes fruits, vegetables, whole grains, lean proteins, and healthy fats, there is no reason to incorporate a supplement, including Irish Sea moss, unless your doctor advises you to do so,” she continues. Now some nutrient requirements might change as you age. In that situation, taking a regular iodine or magnesium supplement may better meet your needs than Irish Sea moss.

Now if you’re really amped to try it, just make sure you do so safely. An appropriate serving for adults is about four grams per day, says Burdeos. She recommends selecting from reputable brands that are transparent about the ingredients in their supplement products.

Look at the dosages and check for a third-party lab test when selecting a product, says Burdeos. Since supplements are not regulated by the FDA, a third-party lab test “shows transparency in product ingredients and that what you read on the label is what you get. It also ensures the product is free from impurities or contaminants, such as heavy metals.”

Perri is a New York City-born and -based writer; she holds a bachelor’s in psychology from Columbia University and is also a culinary school graduate of the plant-based Natural Gourmet Institute, which is now the Natural Gourmet Center at the Institute of Culinary Education. Her work has appeared in the New York Post, Men’s Journal, Rolling Stone, Oprah Daily, Insider.com, Architectural Digest, Southern Living, and more. She’s probably seen Dave Matthews Band in your hometown, and she’ll never turn down a bloody mary. Learn more at VeganWhenSober.com.