Agar-agar is a healthy vegan gelatin substitute to the other gelatins commonly found in wet food.
Carrageenan is commonly used in canned food as a binder or thickening agent. Carrageenan is also commonly thought to have inflammatory properties.
While carrageenan and agar-agar are both derived from seaweed, carrageenan is the chemically derived product of kelp, while agar-agar is the natural product of red algae.