The Brij O range are primary O/W emulsifiers, particularly suited to emulsifying unsaturated fatty acids. Suitable for the formulation of microemulsion gels as primary emulsifiers or as co-emulsifiers paired with Crodafos phosphate esters. They are solubilising, dispersing, spreading, wetting and gelling agents. Brij O20 has been found to be an extremely effective solubiliser for lipophilic vitamins and oil soluble actives. It is effective at remarkably low inclusion ratios of between 2:1 and 5:1 depending on the oil. Recommended topical usage levels of 0.5-10%.