Glycerin, or Glycerol, is a clear, transparent liquid with a high viscosity and a sweet taste. It is highly water-soluble and alcohol-soluble and is a great solvent for other materials, which makes it useful for the preparation of tinctures and foods. Glycerin is a humectant, meaning that it attracts water and maintains the water balance on a cellular level. It moisturizes the skin and prevents dryness. Glycerin is widely used in cosmetic formulations and treatments for medicial conditions of the skin.