Irish Moss is important in the Vegan world.  It is used as a thickener with valueable  nutritional properties.  Some believe
that Irish Moss may have some health risks because it contains carrageenan.  Commercial carrageenan is product made from Irish moss.  The natural carrageenan is removed from the moss and manipulated by chemical means into the food chemical. The natural occurring carrageenan while in it's natural form is not dangerous.

Irish moss flake c/s (chondracanthus chamissoi) can be sprinkled on food, added to salads,soups,

Irish Moss is a common name recognized and associated with red seaweeds (Rhodophyceae) that include Chondracanthus chamissoi (formerly known as Gigartina chamissoi).

Chondracanthus chamissoi, a Rhodophyta from the same Gigartineacea family as Chondrus crispus and other Gigartina species, contains the same carrageenan types as other Gigartina species.