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The plant-based traditional knowledge of many Cameroonian populations concerning beauty and skin care is still poorly documented, yet they are real resources of innovation and economic development. The aim of this study is to document the indigenous knowledge of Choa Arab and Kotoko ethnic group in Kousséri (Far North Region of Cameroon) about plants used for cosmetics. Ethnobotanical data collected among key informants revealed a total of 13 plants species belonging to 12 families used by local people. Canarium schweinfurthii Engl and Santalum album L. obtained the highest frequency of citation. Trees are the most abundant life forms, while barks and seeds are the most frequently used parts. More than 40% of recorded plants are used for skin care. The cosmetic allegations of recorded plants include: dermatology, anti-cancers, antioxidant agent, perfume, anti-inflammatory, antimicrobial, wounds healing activity, skin lightening, dental caries, astringent and hair care. They all contain various phytochemicals that are of interest in cosmetics. Despite the strong relationship between the Choa Arab and Kotoko people and herbal cosmetic ingredients, these plants are still less investigated for their cosmetic application. The authors urge for the development of sustainable supply chain for plants with potentials as cosmetics, involving local communities in the planning, implementation and monitoring process, following principles of Nagoya protocol on Access and Benefit Sharing. more...