What Is Sea Moss? Irish Moss, Iodine and How to Choose It

What is sea moss? In short, it is a red seaweed. The classic species is Chondrus crispus, also called Irish moss, which grows on rocky North Atlantic coasts. In recent years, it has become one of the most talked-about wellness ingredients, so it is worth understanding what it really is.

What is sea moss, botanically?

Botanically, it is a small, branching red alga. Fresh, its frilly fronds range from deep purple to red. Once harvesters dry it in the sun, it turns golden or pale. In the Caribbean, the same name also covers related seaweeds from the genus Gracilaria, which grow in warmer waters.

As a result, two products with the same name can come from different species and different seas. A good label should tell you which one you are getting.

Irish and Caribbean traditions

In Ireland, families boiled Irish moss with milk to make a soft, set pudding. In the Caribbean, meanwhile, people blend the soaked seaweed with milk, spices and sweeteners into a creamy drink. Both traditions treat it as a nourishing food rather than a medicine.

This seaweed is also important in modern food production. It naturally contains carrageenan, a gel-forming fibre that manufacturers use to thicken ice cream, dairy drinks and many other foods.

Iodine and sourcing

Like most seaweeds, it can contain iodine. However, the amount varies a great deal between batches and sources. Your body needs some iodine, but too much can affect the thyroid. For that reason, check with a healthcare professional first if you have a thyroid condition.

Seaweeds also absorb minerals and metals from the water around them. So, sourcing and testing matter. Look for a supplier that tests its seaweed and can share the results.

How to choose a sea moss product

First, check the species name on the label. Next, look at the form, whether raw dried seaweed, gel, powder or part of a blend. Finally, read the serving size and any iodine information. If you are pregnant, nursing or taking medication, speak with a healthcare professional before use.

In our Soursop Bitters, this seaweed sits alongside soursop, senna, turmeric and ginger, in a liquid inspired by Caribbean tradition.

Explore the related ASPHODEL products: ASPHODEL Soursop Bitters. You can also browse every ingredient in our library. For the botanical details, see the full ingredient profile.

Further reading: Chondrus crispus (Wikipedia)