According to media reports, carrageenan is generally used to make synthetic steaks. Carrageenan is a kind of food additive, which can be eaten in moderation. In addition to water retention, it also has a special function, that is, it can bond minced meat together. In addition to carrageenan, there is another additive called TG enzyme, whose professional name is "Glutamine Transaminase", which can catalyze the cross-linking between protein molecules and also has the function of recombining minced meat.
However, it should be noted that there are few bacteria in real steak, so you can eat half-cooked steak without heating it to maturity; "Sticky" steak will have bacteria inside, so it must be cooked thoroughly to be safe.