Sea moss is a type of red algae, also known as Irish sea moss and Irish moss - or Chondrus crispus. It’s harvested for its carrageenan, an ingredient used to thicken milk products like ice cream, but it’s also available raw and in supplement form - think pills, powders, gels and gummies.
Registered dietitian Beth Czerwony, RD, LD, weighs in on sea moss’s benefits and side effects, so you can decide whether this spiny sea vegetable deserves a place in your diet.
Sea Moss Health Benefits
Sea moss is a cousin of seaweed. And while there’s plenty of research data on the health benefits of seaweed, the benefits of sea moss haven’t been studied thoroughly. Still, it’s considered generally safe for consumption, and the benefits are understood to likely be similar to other seaweeds.
“There seem to be quite a few health benefits of sea moss, but they aren’t heavily studied,” Czerwony reiterates. Sea moss is a healthy source of certain vitamins and nutrients that can be a boon for your health.
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It is important to note that sea moss supplements aren't closely regulated by the U.S. Food and Drug Administration. So, there’s no telling whether your sea moss gel or other supplement will necessarily be the healthy addition to your diet that you’re looking for.
Czerwony shares these potential benefits of sea moss.
1. Heart Health
Seaweed is a bit of a superfood. It has a higher fiber content than most vegetables, which is a good thing for your heart and overall health. Fiber has all kinds of positive effects on your body. It can help to:
- Manage your blood sugar
- Lower cholesterol
- Lower blood pressure
- Reduce your risk of chronic diseases like diabetes and heart disease
“Studies show that sea moss may help lower bad cholesterol, which is one of the factors for heart disease,” Czerwony emphasizes. “It’s also been shown to help lower blood pressure, another key factor in heart health.”
2. Weight Loss
Remember how much fiber seaweed has? High-fiber foods are filling foods, which means they may keep you from overeating. “Fiber keeps us fuller longer, which may help with weight control,” Czerwony says.
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3. Thyroid Function
Iodine is one of the keys to a healthy thyroid. That’s because iodine is an important ingredient in making thyroid hormones. Too little thyroid hormone can put you at risk for hypothyroidism.
But your body doesn’t make iodine on its own; you can only get it through diet. Most people get enough iodine from their diet, including from foods like dairy products, seafood and iodized salt. Sea moss may be a good source of iodine for some people who don’t get enough through other means. But be careful not to go overboard, and never take sea moss without a healthcare provider’s recommendation if you have a thyroid condition.
4. Gut Health
Your digestive system is full of bacteria - both good and bad. Balancing out those bacteria is an important element for your well-being. Certain algae, including sea moss, can help keep the good bacteria happy and healthy.
That’s because sea moss is a solid source of fiber and live bacteria. “It can help replenish the good bacteria in our gut,” Czerwony points out. When your good bacteria are thriving, it can help keep your digestive tract in tip-top shape, which can mean less bloating and gas.
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5. Immune Health
Those gut health benefits extend beyond a strong stomach. A healthy gut microbiome is associated with a healthy immune system, too. What’s more, sea moss is high in iron and antioxidants, which both contribute to immune health.
6. Workout Recovery
Sea moss is rich in an amino acid called taurine, which helps with muscle-building. “When we exercise, we get little micro-tears in our muscles,” Czerwony explains, “but amino acids can help with that recovery.”
Muscle-building is also important to your workout success, and sea moss has about 6 grams of protein per 100 grams. But Czerwony cautions against relying solely on sea moss for exercise recovery. Sea moss may help, but it’s not a replacement for following a healthy exercise program that includes eating healthy food, staying hydrated and getting the rest your body needs.
7. Women’s Health
Women may benefit from sea moss in specific ways. For example:
- Fiber helps regulate hormones, in addition to its weight loss and heart-health benefits. For females, that may translate to supporting regular menstrual cycles and increasing fertility.
- Calcium can help females maintain bone density as they age. During perimenopause and menopause, estrogen levels drop, which can affect bone health and lead to osteoporosis.
8. Men’s Health
Sea moss can also have specific benefits for men. Give zinc the credit here. Zinc can support male sexual health in a few ways, including helping maintain healthy testosterone levels and potentially improving sperm quality (and, therefore, improved fertility).
Side Effects of Taking Sea Moss Supplements
Sea moss is mostly thought to be healthy, though it contains inconsistent amounts of both good nutrients and some less healthy stuff. “Sea moss is a product of its environment, so its nutritional value depends largely on where it’s grown,” Czerwony clarifies. “Unfortunately, there’s no real way to know exactly what’s in it or how much, and one batch may have higher potency than the next one.”
Sea moss is associated with two key risks:
- You could consume too much iodine. Too much of a good thing becomes a bad thing, as is the case with iodine. In fact, endocrinologists advise against taking iodine supplements unless specifically indicated by your doctor, as they may actually have a negative effect on your thyroid.
- It contains heavy metals. Seaweed and sea moss are known to absorb heavy metals from the water in which it grows. It’s not toxic in small amounts, but you definitely don’t want to overdo it on seaweed consumption.
Not of risk but still of note is sea moss’s slimy texture and fishy taste. Raw sea moss has an earthy, underwater taste similar to clams and oysters. “If you don’t like seafood, the flavor of raw sea moss is probably not going to be for you,” Czerwony warns.
Sea moss shouldn’t have much of a taste in supplement form. But taste aside, you may also be put off by sea moss’s mouthfeel: In gel form, it has a slick, thick texture similar to aloe vera. If it bothers you, try switching to a different type of supplement.
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How Much Sea Moss to Take?
One study found that 4 grams of sea moss per day is typically safe - but you should still check with your healthcare provider before taking sea moss or any nutritional supplement.
If you already have hyperthyroidism or hypothyroidism, don’t take sea moss unless specifically advised by your healthcare provider.
How to Add Sea Moss to Your Diet
Sea moss is available raw, as well as in a variety of supplement forms, including:
- Capsules
- Gels
- Gummies
- Lotions
- Powders
Which version you take is up to you. “It’s really about whatever your preference is,” Czerwony says, “so long as you’re following proper dosing instructions.”
But whether you’re taking sea moss supplements or loading up on other types, it’s worth remembering that you can’t out-supplement a bad diet. “Sea moss does have potential health benefits, but having a good, varied diet is going to be the most helpful to your body,” Czerwony reinforces. “Don’t depend on supplements. That goes for sea moss and any other supplement you find.
Understanding Sea Moss Varieties
Sea moss, also called Irish moss, Jamaican moss, gold moss, or African moss, is a nutrient-rich seaweed known for supporting wellness, digestion, and energy. With over 90 minerals, it’s often used in smoothies, gels, and even skincare. One of the highest mineral concentrations in sea moss is iodine, an essential trace element that plays a crucial role in various bodily functions. Iodine is essential for the production of thyroid hormones (thyroxine and triiodothyronine), which regulate metabolism, growth, and development.
Here’s your guide to the most popular varieties:
1. East Coast Sea Moss
- Fan-shaped with flat, branching leaves.
- Stronger ocean flavor and more potent mineral profile.
- Commonly processed into carrageenan, a natural food additive extracted from red seaweed that functions as a thickener, gelling, and stabilizing agent in many processed foods, including dairy, meat, and non-dairy products.
- This type of sea moss is not as nutrient dense as the others, but it is the most commonly used type of sea moss commercially.
2. Gracilaria (Caribbean Sea Moss)
- Found in warm Caribbean waters like Jamaica and St. Lucia.
- Thin, stringy strands with a lighter texture.
- Mild taste, perfect for smoothies and juices.
- This type of sea moss is more commonly available for DIY, and most natural food stores use this variant for their sea moss offerings.
- People prefer this sea moss because it is the least oceanic in taste and the most versatile in profile. All different types of colors are present in the Caribbean sea, gold being the most present.
3. Gold Sea Moss
- Sun-dried and harvested from shallow waters.
- Neutral flavor, versatile in recipes.
- Popular choice for everyday use.
- Most sea moss gel that is available uses gold sea moss as the base.
4. Purple Sea Moss
- Grows deeper in the ocean with less sunlight.
- Rich in antioxidants from natural pigments.
- Stronger, earthy flavor profile.
- Purple Moss has more depth, is typically more dense, and is in less direct sunlight; this moss boasts the presence of pigments like anthocyanins (antioxidants); this moss boasts a stronger color, more antioxidants, stronger flavor; prized for its “superfood” feel.
5. Green Sea Moss
- High in chlorophyll, giving it a vibrant green color.
- Potent detoxifying properties.
- Distinct, stronger ocean taste.
- The amount of chlorophyll present is sometimes due to growth near the surface or in nutrient conditions that favor green pigments, such as near other mosses or sea plants. This moss is the rarest of them all and is not usually as readily available as the other variants.
6. Full-Spectrum Sea Moss
- A natural mix of gold, purple, and green.
- Contains a wide range of minerals and antioxidants.
- Perfect for colorful, nutrient-rich gels.
- This is the most natural way to find and receive sea moss. Full-spectrum, boasting a rainbow of colors, is for sure the healthiest version as it has a vast nutrient profile in the seaweed.
Comparing Chondrus vs Gracilaria
Because both species are commonly sold as “sea moss” or “Irish moss,” it’s good to know their differences:
- Nutrient potency: Chondrus crispus is often considered “higher potency” by some, due to its dense texture and the cold water environment, which may affect nutrient density.
- Growth & availability: Gracilaria tends to be more available and sustainable for commercial use, especially grown in warm, accessible waters; Chondrus is more seasonally harvested and often more expensive.
- Taste / smell: Chondrus is more pungent; Gracilaria tends to be milder.
Important Usage Tips:
- Upon arrival, immediately place your sea moss in the refrigerator!
- If you start to see mold growing on top, then your sea moss has begun to go bad. Also, you will notice a strong, foul smell present.
- Absolutely! To use as a face mask, simply apply about 1-2 tbsp to your face, leave on for 30 minutes, then rinse with water. It's best to do this at night before bed.
Here’s a table summarizing the key differences between the sea moss varieties:
| Variety | Color | Flavor | Nutrient Highlights | Best Use |
|---|---|---|---|---|
| East Coast | Reddish-brown | Strong ocean flavor | Carrageenan | Commercial food additive |
| Gracilaria (Caribbean) | Various (Gold, Purple, Green) | Mild | Versatile mineral profile | Smoothies, juices, DIY gels |
| Gold | Gold | Neutral | General minerals | Everyday use, gel base |
| Purple | Purple | Earthy | Antioxidants (Anthocyanins) | Superfood applications |
| Green | Green | Strong ocean taste | Chlorophyll | Detoxifying applications |
| Full-Spectrum | Mix of Gold, Purple, Green | Varies | Wide range of minerals and antioxidants | Nutrient-rich gels |
