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Heavy water (deuterium oxide (2H 2O) or D 2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
1 If you drink too much water, you can suffer a condition called water intoxication or hyponatremia. People have died from it. 2  There are different forms of water. Heavy water has the exact same molecular structure as regular water, except one or more of the hydrogen atoms is replaced with deuterium.