Elemental Sponge is a Gene Tonic in BioShock 2. It restores a small amount of EVE whenever health is lost due to elemental damage. If the player has Electric Flesh equipped, then they will not gain EVE when hit with electric attacks.

Elemental Sponge

Minerva's Den Edit

Found on a fan grate in the East wing of Climate Control in Operations. Can be seen through a glass window from the main path. Unobtainable in Gatherer's Garden.