A century-old tuberculosis vaccine can regulate blood sugar

Drug repurposing often happens by accident or during moments of desperation. While modern medications like GLP-1 agonists are currently making headlines for their expanding list of uses, some of the most significant breakthroughs come from much older sources. The Bacillus Calmette-Guerin vaccine, which has been used to prevent tuberculosis for over 100 years, has shown a surprising ability to regulate blood sugar levels in people with type 1 diabetes.