Insulin is a naturally occurring hormone made by the pancreas that helps our body use or store the glucose (sugar) it gets from food. For people with diabetes, either the pancreas does not make enough insulin to meet the body's requirements, or the body cannot properly use the insulin that is made.
The yellow color in normal urine comes from a substance known as urochrome. Urochrome is also known as urobilin and is the result of hemoglobin breakdown. Hemoglobin is the protein in red blood cells that enables oxygen to be taken around the body.
What is the cause of bright yellow urine? A: Using certain medications and vitamin supplements, such as B-complex vitamins, can make urine a bright yellow color, according to WebMD. The color of urine typically depends on the concentration of the yellow pigment called urochrome.