Insulin was discovered nearly 100 years ago.

The life-saving medication is used to treat diabetes. In the past two decades, the price of the drug has spiked by 700 percent.

In November, Vermont Sen. Bernie Sanders pointed out that certain insulins had risen from $21 a vial in 1996 to $255 a vial in 2016.

Some have likened the insulin price boosts to the recent price hikes for EpiPen .

On Nov. 17, the American Diabetes Association issued a call for Congress to investigate insulin pricing.

They’re urging solutions so that people with diabetes don’t face financial hardship, purchasing a medication they need to stay alive.