Needs to be cooked to be consumed to heal life points.
Notes:
You need to have completed the Priest in Peril Quest to access the Haunted Woods and the Mort Myre Swamp (needs also to have at least started the Nature Spirit quest). Use a pestle and mortar on any raw snail while holding a sample bottle to make Blamish snail slime, an ingredient for making oily fishing rods to fish lava eels.