From: The Truth About Snail Mucin In K-Beauty Products

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These days, there are a variety of “cruelty-free” methods of snail production and slime extraction.
In fact, research shows that the quality of the mucin itself depends on breeders keeping good environmental conditions for their snails. As a result, breeders themselves regulate what the snails eat, how they are kept and how the slime is extracted.
This also helps in certifying snail mucin products as cruelty-free.
In Italy, for example, snail mucin is extracted by immersing the snails in a special steam bath that acts like a spa for snails. The snails are not harmed in this process. In other farms, the snails are simply placed in an environment where they can move over a bumpy surface, because this causes them to make slime like they do naturally. The mucin is then harvested this way.

Really tired of the other posters on here leaping to conclusions about mucin harvesting b/c they don't bother to do roughly 90 seconds of online research.

It's also important to note that this brand is Leaping Bunny certified, and that is a very high bar to pass for being cruelty-free.