Liquid extracts marsdenia cundurango, cosmetic compositions comprising them and their cosmetic uses.

The invention relates to a process for obtaining an extract of Marsdenia cundurango containing cinnamate terpenyl compounds, extracts of bark or wood of Marsdenia cundurango comprising cinnamate terpenyl compounds obtained by the process, cosmetic compositions comprising them and their cosmetic uses to improve the barrier function of the skin, to improve the protection against toxins and detoxification of the skin and finally to reduce the signs of aging.