Natural products and their biological activities are nowadays the subjects of interest for the pharmaceutical industries, healthy foods, and cosmetics. The scientific interest in this field is increasing due to society's awareness of the importance of biodiversity and economic and cultural sustainability (Ekiert and Szopa, 2020).

In the state of Espírito Santo, Brazil, Lecythis pisonis a native tree that belongs to the Lecythidaceae family, also popularly known as Sapucaia, produces woody fruits containing edible nuts, commercialized by the food industry. The parts of the fruit, like arils, almond shell (tegument) seed, and epicarp, are discarded. Previous studies demonstrated that not only the Sapucaia nuts have economic value. The nuts oil demonstrated high quality such as canola oil, like yellow color, and characteristic odor, and composed of oleic and linoleic acids as the abundant fatty acids (Rampazzo et al., 2020; Dduarte et al., 2015).

Nowadays the circular economy seeks the full use of resources. There is no waste, but by-products that strengthen the value chain, stabilize the supply chain, integrate various productive sectors, and ensure a breadth of development possibilities where previously only one main characteristic was observed. The reinforcement the family agriculture in Espírito Santo corroborates the technological development of the state and is an important tool for a sustainable socio-economic environment (Schroeder et al., 2019; Nakagawa, 2021).

To promote the sustainable use of the product it is necessary to understand the necessities of the economic scenario. In Brazil, the beauty market is one of the most promising being the world's fourth-largest cosmetics and personal care, behind only the United States, China, and Japan. The asking for natural products has increased in the last years. To manufacture cosmetic products with natural ingredients the process of inputs includes the activities of extracting, synthesizing, purifying, transforming, importing for own use, storing, shipping, and distributing (ANVISA, 2013). These products are also submitted to chemical, physical, and microbiological evaluations, for safety and efficiency (Prista et al., 1992; Tavares et al., 2020).

To attempt to add value to the biomass of the sapucaia, this study aimed to develop a natural dermo-cosmetic emulsion using the almond shell extracts, by-product, and evaluate its physical-chemical stability and safety for dermo-cosmetic use.