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The process, according to Nature World News, distributes the mollusks' mucus over your visage and is said to "remove dead skin, soothe any inflammation and help the skin retain moisture." Whether the process actually does anything is a matter of debate among dermatologists, although snail mucus contains ingredients like hyaluronic acid and proteoglycans, which are used in cosmetics and are known to promote tissue flexibility and skin healing.
Also, these aren't your typical garden-variety snails. According to Miho Inada at the Wall Street Journal, these shelled celebrities are given the A-list treatment within the spa: