Is Sea Moss Actually Moss?
You know the name. You might even have a jar in your fridge. But is sea moss actually… moss?
It’s a fair question. Is it something that grows underwater? Is it seaweed? And why do people talk about Irish moss when BOOD’s comes from Saint Lucia?
Let’s untangle it.
First things first: it isn’t actually moss
Despite its name, sea moss is seaweed—specifically, a type of red algae.
The moss growing on a garden wall and the sea moss in your smoothie belong to very different groups.
“Sea moss” is a common name, rather than the scientific name of one particular species. That’s where things can get a little confusing.
Sea moss, Irish moss, cottonii—what’s the difference?
You’ll often see these names when browsing sea moss products, but they don’t always mean the same thing.
Two types you might come across are:
Chondrus crispus: commonly called Irish moss
This red seaweed grows along North Atlantic coastlines, including Ireland. You might also hear it called carrageen moss.
It typically has flatter, branching fronds that spread into a fan-like shape.
Cottonii: the name you’ll see at BOOD
At BOOD, we use sea moss known as Eucheuma cottonii, sourced from Saint Lucia.
Its accepted scientific name is Kappaphycus alvarezii, although “cottonii” remains widely used in the seaweed trade.
Compared with the flatter fronds of Chondrus crispus, it generally has rounder, thicker branches with a bushier appearance.
No need to memorise the Latin. The useful takeaway is that the words “sea moss” alone don’t tell you exactly which seaweed is inside.
Do they feel different, too?
In their original form, their different shapes give them a different feel.
Once made into a gel, though, the finished texture also depends on the preparation, the amount of water used and any other ingredients.
A thicker gel doesn’t automatically mean a better product. Texture is one part of the picture, rather than a quality test on its own.
What about their benefits?
Different seaweeds don’t necessarily have identical nutritional profiles. Growing conditions and preparation can also affect what ends up in the finished product.
That means it’s too simple to declare one type “better” based on its name, colour or appearance.
We’d rather help you understand what you’re buying, where it comes from and what’s in your jar, without turning it into a competition between species.
If it’s red algae, why isn’t it always red?
Another naming surprise: “red algae” describes the group it belongs to, rather than a promise about its colour.
These seaweeds can vary in appearance, and drying and processing can change their colour further. So, a golden-looking sea moss can still belong to the red algae group. Colour alone won’t reliably tell you its species.
How does seaweed become a spoonable gel?
The gel in your fridge looks quite different from the seaweed it began as.
Dried sea moss absorbs water during soaking, becoming softer and fuller. Further preparation and blending turn it into the spoonable gel you recognise.
Both types naturally contain carrageenans—substances found in their cell walls that contribute to their thickening and gelling properties. That familiar spoonable texture starts with the seaweed itself.
That familiar texture starts with the seaweed itself.
Why Saint Lucia matters to BOOD
For us, Saint Lucia is more than a place on an ingredients journey.
It’s part of Jon’s family heritage and the food traditions that helped inspire BOOD - from family kitchens to the everyday routines shared between generations.
Knowing what our sea moss is matters. Knowing the story behind it matters to us, too.
A little more knowledge with your next spoonful
You don’t need a marine biology degree to enjoy sea moss. But a few simple questions can help you understand your jar:
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Which seaweed does the brand use?
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Where is it sourced?
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What ingredients are in the finished product?
And the next time someone asks whether you’re really putting moss in your smoothie, you’ll have the answer.
Seaweed, actually. Mystery solved.
feel good. do good.
Sea Moss, Sea Moss Education, Irish Moss, Eucheuma Cottonii, Saint Lucia, Seaweed