Liquid nitrogen is not a toxic material, which is why it is widely used in the food and medical industry; however, its characteristics require certain precautions in handling.
At such low temperatures, liquid nitrogen can quickly cause cold burns or even frostbite on the limbs. The use of insulating clothing is recommended, as well as gloves and safety glasses. Whenever working with liquid nitrogen, proper ventilation or self-contained breathing apparatuses should be used.
Nitrogen is colorless and odorless. A liquid nitrogen leak can evaporate and accumulate in an imperceptible cloud of gas that will displace the air in an enclosure, creating a suffocation hazard for humans and other living beings. Periodic reviews of the containers' pressure and the other systems associated with their use is recommended.