They claim that iodine supplements are dangerous. Those who advocate supplementing directly with iodine argue that the concern is only for product purity. Applying iodine to the skin and allowing it to penetrate is considered a good self test for iodine deficiency. The premise is that the body will absorb iodine to satisfy its needs. So if a painted patch of iodine is quickly absorbed, in an hour or less, it may be a sign the body needs more iodine.
Insulin (from the Latin, insula meaning island) is a peptide hormone produced by beta cells in the pancreas. It regulates the metabolism of carbohydrates and fats by promoting the absorption of glucose from the blood to skeletal muscles and fat tissue and by causing fat to be stored rather than used for energy. Insulin also inhibits the production of glucose by the liver.
The body uses sugar, also called glucose, to supply the energy it needs to function. People get sugar from their diet and from their body tissues. Insulin is made by the pancreas and affects the outer membrane of cells, making it easy for glucose to move from the blood into the cells. When insulin is active, blood glucose levels fall. Sugar from body tissues is stored in the form of glycogen.