A chemical found in a number of plants around the world has shown promise in regenerating pancreatic cells lost to Type 1 diabetes.
From Diabetes UK:
Harmine is derived from Harmal, a flowering plant, but the drug is known for its psychoactive effects on the brain. It is an ingredient in the psychoactive mixture ayahuasca and is reportedly used in spiritual ceremonies.
Medical Daily adds this:
The researchers discovered harmine’s ability to reproduce beta cells in a culture. Then, they injected human islets into diabetic mice and administered harmine, triggering beta cell production and normalizing blood glucose control. Harmine was able to triple the number of beta cells within the mice’s pancreas.