The snail slime used in skin care products has been concentrated and purified. These steps work to remove bacteria and germs from the slime, making it safe to use on the skin. However, it is possible for individuals to be allergic to snail slime.  So, if you’re trying a product with snail mucin for the first time, it would be a good idea to test it on the inside of your arm. Wait a few hours or more to confirm that you don’t have any negative reaction.