although very little isinglass remains in the beer when it is drunk, many vegetarians consider beers that are processed with these finings (such as most cask-conditioned ales in the uk) to be unsuitable for vegetarian diets (although acceptable for pescetarians). according to global data in 2018, along with low-calorie beer and gluten-free beer, beers that are acceptable for these strict vegetarians are expected to grow in demand in the coming years. the demand increase is attributed to millennial consumers, and some companies have introduced vegetarian friendly options or done away with isinglass use. a beer-fining agent that is suitable for vegetarians is irish moss, a type of red algae containing the polymer chemical carrageenan. however, carrageenan-based products (used in both the boiling process and after fermentation) primarily reduce hazes caused by proteins, but isinglass is used at the end of the brewing process, after fermentation, to remove yeast. since the two fining agents act differently (on different haze-forming particles), they are not interchangeable, and some beers use both.