Insulin

 

Insulin was discovered in Toronto in 1921 because a unique mix of an intuitive surgeon's specific hypothesis, a well-equipped university physiology laboratory, and an ethical decision to share the patent made the breakthrough possible. [1, 2]

Why Toronto in 1921?

The Right Idea: Canadian surgeon Frederick Banting had a sudden insight in late 1920 that tying off pancreatic ducts would destroy digestive enzymes before they broke down the internal secretion needed to control blood sugar. [1, 2, 3]
The Right Institutional Support: Banting took his idea to John J. R. Macleod, a leading professor of physiology at the University of Toronto. Macleod provided Banting with a proper laboratory, experimental dogs, and medical student Charles Best as an assistant for the summer of 1921. [1, 2, 3]
Biochemical Expertise: When Banting and Best successfully extracted the substance, biochemist James Collip joined the team and successfully purified the extract so it was safe and effective enough for human injection. [1, 2, 3]

Why Was It Shared with the World?

No Financial Monopolies: The researchers refused to profit personally from a discovery meant to save dying children. They sold the patent for a symbolic one dollar to the University of Toronto. [1, 2]
Open Production: The university licensed the manufacturing rights royalty-free to pharmaceutical companies. This choice ensured rapid, wide-scale mass production and global distribution instead of restricted access. [1, 2]