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.
Actually, your urine is yellow because your body only absorbs what it needs and the rest is excreted. If your body didnt excrete the excess then you would have an overdose of vitamin B. It is a good sign that your urine is yellow. It means your body is working properly in conjunction with the vitamin B. Your body isnt going to absorb what it doesnt need.