Self-experimenter drank heavy water, then lived a long life.
February 9, 1935 | Vol. 27 | No. 722
Pharmacologist drinks heavy water in experiment
Taking the risk of swallowing ten grams (about third of an ounce or teaspoonful) of “heavy water,” Prof. Klaus Hansen, Oslo University pharmacologist, reported that he had apparently suffered no ill effects after five hours, sufficient to allow assimilation of deuterium-containing water.
Nevertheless he was attended by four doctors ready with stomach pumps, heart and respiratory stimulants for emergency use if they seemed to be needed.