Ice cream made with liquid nitrogen is safe to eat.
Once the liquid nitrogen has evaporated, the ice cream is safe to eat.
However it's also crucial that you handle the ice cream made with liquid nitrogen with care to avoid frostbite and possible ingestion of liquid nitrogen.
The liquid nitrogen is extremely cold and causes rapid freezing of the ice cream mixture that results in a smoother, creamier texture.
It's also essential that food grade nitrogen is used for making ice cream with liquid nitrogen and avoid direct contact with the liquid nitrogen itself, which can cause severe burns.
Also before consuming or serving the ice cream made with liquid nitrogen you should ensure that there's no residue of liquid nitrogen in the service container before serving the ice cream or eating the ice cream.
You should also avoid inhalation of the liquid nitrogen when making the ice cream as the vapors released by the liquid nitrogen is cold and can be harmful if inhaled so avoid breathing the vapors of the liquid nitrogen directly.
And allow the ice cream made with liquid nitrogen to thaw slightly before you eat it to avoid potential burns from the extreme cold of the liquid nitrogen.
Also while liquid nitrogen ice cream is safe to eat, the FDA also advises against eating, selling or handling food products prepared by adding liquid nitrogen at the point of sale.
And if you're making liquid nitrogen ice cream, you should follow the recommended guidelines for safe handling and preparation and wear appropriate personal protective equipment like gloves, safety goggles and a lab coat when handling liquid nitrogen.
Also store liquid nitrogen ice cream in a freezer at a safe temperature.