In large enough amounts, yes. The United States and a few other countries use a massive dose of potassium chloride to carry out executions by lethal injection.
Elemental potassium can also be deadly. It will react explosively with water, setting itself on fire and producing caustic potassium hydroxide.
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Potassium maintains normal nerve and muscle activity, especially of the heart, and osmotic pressure within the cells. It also assists in the cellular metabolism of carbohydrates and protein.