Frozen Field is a Gene Tonic featured in BioShock. It serves to protect the player from cold damage and enhances attacks made with the Wrench. It also covers the wrench in permafrost, and creates a small cloud of ice vapor around the player's lower body, although this is purely aesthetic.
Players are advised to be careful with the freezing effect, as frozen enemies shatter when hit and leave no corpse to be looted. The two Tonics can be stacked for a 45% reduction in incoming cold damage, 30 extra points of cold damage with the Wrench per hit and a 30% chance of freezing an enemy per hit.
To put it plainly, this is a tonic that is only worth using in a difficulty mode where scavenging is not essential, as such it is not advised to use it in Hard or Survivor modes.
However, it can still be effective, allowing the smarter player to take more time in combat without panicking by hitting an enemy until he freezes, then hitting the other until it happens again and keep going like that until the fight is over. As such, it is most useful for Thuggish Splicers and Spider Splicers who tend to bunch up in a fight against the player, thus evening the odds.