Caviar is a delicacy made from the eggs of sturgeon fish. It is high in protein and omega-3 fatty acids, but it also contains high levels of mercury.
Mercury is a heavy metal that can be toxic to humans. The amount of mercury in caviar varies depending on the type of fish used and where it was sourced from. In general, though, caviar does contain higher levels of mercury than other types of seafood.
This doesn't mean that you should avoid eating caviar altogether. Mercury poisoning from seafood is rare, and the health benefits of omega-3 fatty acids outweigh the risks posed by mercury exposure. If you are concerned about your mercury intake, though, you may want to limit your consumption of caviar or choose brands that have lower levels of mercury.