Lactic acid is a weak electrolyte. It can be ionized into hydrogen and lactate ions. Most salt solutions are electrolytes. Electrolytes are compounds that conduct electricity when dissolved in aqueous solution or by themselves in the molten state. Electrolytes are substances bonded by ionic or polar covalent bonds. Compounds can dissociate into free-moving ions when dissolved in water or when heated. Lactic acid is a fatiguing substance and a waste product of the process of heat production. The body needs most of its energy to survive from sugar. The blood sends glucose to the organs as needed to burn it and produce heat. This process produces water and carbon dioxide if there is an adequate supply of oxygen, and if there is an inadequate supply of oxygen, pyruvate will combine with NADH to produce lactic acid and oxidized coenzymes.