Kainic acid (kainate) is a natural marine acid present in some seaweed. Kainic acid is a potent neuroexcitatory amino acid that acts by activating receptors for glutamate, the principal excitatory neurotransmitter in the central nervous system. Kainic acid is commonly injected into laboratory animal models to study the effects of experimental ablation. Kainic acid is a direct agonist of the glutamic kainate receptors and large doses of concentrated solutions produce immediate neuronal death by overstimulating neurons to death. Such damage and death of neurons is referred to as an excitotoxic lesion. Thus, in large, concentrated doses kainic acid can be considered a neurotoxin, and in small doses of dilute solution kainic acid will chemically stimulate neurons. Kainic acid is utilised in primary neuronal cell cultures and acute brain slice preparations [5] to study of the physiological effect of excitotoxicity and assess the neuroprotective capabilities of potential therapeutics. Kainic acid is a potent central nervous system excitant that is used in epilepsy research to induce seizures in experimental animals, at a typical dose of 10–30 mg/kg in mice. In addition to inducing seizures, kainic acid is excitotoxic and epileptogenic. Kainic acid induces seizures via activation of kainate receptors containing the GluK2 subunit and also through activation of AMPA receptors, for which it serves as a partial agonist.