Foam formulation comprises an emulsion comprising an oil phase and a water phase. The emulsion comprises at least one triterpenoid. An independent claim is also included for an emulsion comprising an oil phase and a water phase, where the emulsion comprises at least one triterpenoid comprising betulin, betulinic acid, lupeol, erythrodiol, oleanolic acid and/or (1-6C) alkyl esters of the above mentioned acids. ACTIVITY : Antibacterial; Hepatotropic; Antimalarial; Virucide; Cytostatic; Vulnerary; Antiinflammatory. No biological data given. MECHANISM OF ACTION : None given.