 Cyclodextrin, CD, molecules are cyclic oligosaccharides with unique physical and chemical properties. They are used as excipients in many pharmaceutical products due to their ability to solubilize poorly water-soluble drugs, acting as organic co-solvents. CDs can also form nanoparticles and microparticles, which can lead to erroneous experimental results if not properly controlled for. Additionally, CDs can increase drug permeability through lipid membranes, but without disrupting the integrity of the membrane. This article was authored by Thorstein Loftson, Hacken Raffensigertsen and Fatsoi Jansuke.