Snail Secretion Filtrate

Snail secretion filtrate is primarily a humectant/skin-conditioning ingredient used at a few percent up to higher levels in “snail” serums, and it is generally well-tolerated but not inert. Patch-test and consumer reports show occasional irritation or allergic-type reactions (itching, stinging, flares) in reactive or eczematous patients, likely due to its complex protein/glycoprotein composition and potential trace impurities from processing. Given the non-trivial risk in compromised barriers and the need to err on patient safety, I score it as mild rather than gentle. Safety Notes: In commercial skincare, snail secretion filtrate appears at very low levels (~0.1–1%) in multi-ingredient creams/cleansers and some rinse-off products where it functions mainly as a minor humectant/marketing active. Mid-range leave-on essences/serums commonly use ~10–40%, while multiple widely sold consumer essences/ampoules are marketed as very high snail content (typically ~80–96% and up to ~97%), which represents the upper end observed for OTC leave-on products rather than a regulatory maximum.