Complete the analogy: Pancreas : Insulin :: Liver : ?

The relation is an organ : the fluid it makes and pours out. The pancreas makes insulin; the liver makes bile, which passes on to help break down fat. Each distractor is the product of a different gland, and that is what makes them tempting — saliva comes from the salivary glands, adrenaline from the adrenal glands above the kidneys and sweat from the sweat glands in the skin.