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The very first insulin injection to treat diabetes

Leonard Thompson | January 11 & 23, 1922

By: UMass Diabetes Center of Excellence


By the early 1920s, many researchers strongly suspected that diabetes was caused by a malfunction in the digestive system related to the pancreas gland. At that time, the only way to treat the fatal disease was through a diet low in carbohydrates and sugar, and high in fat and protein. That diet allowed people diagnosed with diabetes to live for about another year. 

On January 11, 1922, 14-year-old Leonard Thompson became the first person to receive an insulin injection as a treatment for diabetes. Prior to that, people with Type 1 diabetes did not survive for more than a few weeks or months with the disease.

Thompson's first dose had an apparent impurity which caused an allergic reaction. A refined process was quickly developed to improve the cow pancreas from which the insulin was derived, and his second dosage was successfully delivered twelve days later on January 23.

Frederick Banting and Charles Best discover insulin as a life-saving therapy for diabetes

A breakthrough came at the University of Toronto in the summer of 1921, when Frederick Banting and Charles Best successfully isolated insulin from canine test subjects, produced diabetic symptoms in the animals, and then began a program of insulin injections that returned the dogs to normalcy. Their discovery was announced to the world on November 14, 1921.

Two months later, with the support of John Macleod of the University of Toronto, the two scientists began preparations for the first insulin treatment to be administered to a human. With the help of biochemist J.B. Collip, they extracted a reasonably pure formula of insulin from the pancreas of cattle from slaughterhouses, and used it to treat Leonard Thompson.

Leonard Thompson became the first person to receive an insulin injection

The Canadian teenager improved dramatically, and the University of Toronto immediately gave pharmaceutical companies license to produce insulin, free of royalties. By 1923, insulin had become widely available, saving countless lives around the world, and Banting and Macleod were awarded the Nobel Prize in Medicine. To this day, it’s still the quickest that a Nobel Prize was awarded following the discovery of a medical breakthrough.

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