Neurotoxic Shellfish Poisoning (NSP) is a type of food poisoning caused by consuming shellfish contaminated with toxins produced by certain algae, particularly Karenia brevis. These toxins can affect the nervous system, leading to symptoms such as tingling, numbness, and muscle weakness. NSP is most commonly associated with eating clams, oysters, and mussels that have accumulated these harmful toxins. It is important for consumers to be aware of local shellfish advisories and to avoid harvesting shellfish during harmful algal blooms to reduce the risk of poisoning.