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After a snail mucus skin care boom in South Korea, the product—also referred to as snail mucin or secretion—was widely shared on social media.

One particular item took off — a snail mucin essence from popular Korean brand COSRX.

Even if the tear supply is adequate, a mucin deficiency can impede wetting of the cornea and damage its surface.

A lung secretion induces mucus production, and the researchers began by testing its individual components to see which ones upregulated the genes for the proteins mucin 5B and mucin 5AC — two major constituents of mucus.

And in the intestine, yet another mucin — MUC2 — is the main player.