Diabetes in Pets

Iletin from Eli Lilly. Beef R/Neutral in varying strengths--not highly purified, nor were there any suspension insulins at the time. Photo is likely ca. 1922-1923.

Eli Lilly's brand name for the beef, beef/pork[1], and pork insulins it formerly produced. When the company began producing insulin in 1922, it called its insulin derived from bovine pancreas Iletin[2][3][4][5]. Eli Lily announced the discontinuation[6] of the last of its natural Iletin insulins in July 2005.

Iletin I beef/pork insulins in Regular/Neutral, NPH/Isophane and Lente types. The insulin was discontinued by Lilly in 1998.