Rationing insulin is a dangerous practice, but one-in-four diabetics admits to having done it. Insulin prices are a big reason why.

Nichole Smith-Holt lost her 26-years-old son, Alec, last year when he began rationing insulin, unable to afford each month’s supply. Since his death, she has made it a mission to address insulin insecurity.

The price of the insulin more than doubled from 2002 to 2013.

Indianapolis-based Eli Lilly, along with two other European pharmaceutical companies, is facing a price-fixing lawsuit regarding its rapidly escalating insulin prices.

In a letter, Vermont Sen. Bernie Sanders and Maryland Rep. Elijah Cummings criticize three insulin manufacturers -- including Indianapolis-based Eli Lilly -- for skyrocketing insulin prices.