A very informative overview by Gattefossé on its excipients and uses thereof.
Lipid excipients for topical drug delivery include solubilizers, emulsifiers and viscosity modifying agents. Emulsifiers are designed for challenging formulations and deliver excellent texture and sensorial properties. Solubilizers provide skin penetration enhancement and viscosity agents stabilize formulations. Excipients are used in creams, emulgels, lotions, foams, microemulsions and gels. For information on excipient application and formulation processes please see the Formulation Technologies section.