{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:45:54Z","timestamp":1760060754690,"version":"build-2065373602"},"reference-count":153,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2025,9,16]],"date-time":"2025-09-16T00:00:00Z","timestamp":1757980800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"PT national funds (FCT\/MECI, Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia\/Minist\u00e9rio da Educa\u00e7\u00e3o, Ci\u00eancia e Inova\u00e7\u00e3o)"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cosmetics"],"abstract":"<jats:p>This review concentrates on the bioactive potential of two significant agri-food by-products: coffee by-products (coffee pulp and husk, spent coffee grounds, and silverskin) and olive by-products (olive mill wastewater, pomace, stones, and leaves). These residues are produced in substantial quantities, and despite their considerable application potential, they remain predominantly underutilized, thereby contributing to environmental burdens and economic losses. Their richness in bioactive compounds is unequivocal. Specifically, coffee by-products are abundant in caffeine and chlorogenic acids, whereas olive by-products serve as excellent sources of oleuropein, hydroxytyrosol, and tyrosol. Such compounds possess health-promoting properties and are promising active ingredients for cosmetic formulations, owing to their antioxidant, anti-aging, UV protective, antimicrobial, emollient, and moisturizing effects. This review not only compiles the bioactive compounds present in these by-products and explores their potential applications but also examines the extraction methods employed for their recovery. Both conventional techniques (solvent extraction) and green extraction technologies (ultrasound-assisted extraction, microwave-assisted extraction, and supercritical fluid extraction) are discussed. These innovative and environmentally friendly approaches enhance extraction efficiency and are aligned with sustainability objectives. In this context, the importance of incorporating natural ingredients into cosmetic products is emphasized, both to meet regulatory and environmental standards and to satisfy the increasing consumer demand for safer, more effective, and environmentally sustainable formulations.<\/jats:p>","DOI":"10.3390\/cosmetics12050206","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T05:59:51Z","timestamp":1758088791000},"page":"206","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Potential of Coffee and Olive by Products as Ingredient in Cosmetics Formulations and Their Extraction Techniques"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-1230-1373","authenticated-orcid":false,"given":"Ana Matilde","family":"Ferreira","sequence":"first","affiliation":[{"name":"LAQV\/REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal"},{"name":"Mesosystem Investiga\u00e7\u00e3o & Investimentos by Spinpark, 4805-017 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5053-513X","authenticated-orcid":false,"given":"Rita C.","family":"Alves","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2095-6435","authenticated-orcid":false,"given":"Bernardo","family":"Bastos","sequence":"additional","affiliation":[{"name":"Mesosystem Investiga\u00e7\u00e3o & Investimentos by Spinpark, 4805-017 Guimar\u00e3es, Portugal"},{"name":"Department of Hospitality and Tourism, Faculty of Social Sciences and Technology (FSCT), European University, Oriente Green Campus, 1886-502 Lisbon, Portugal"},{"name":"CETRAD-UE\u2014Center for Transdisciplinary Development Studies, Universidade Europeia, 1500-210 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6767-6596","authenticated-orcid":false,"given":"Maria Beatriz P. P.","family":"Oliveira","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal"}]},{"given":"Ana","family":"Casas","sequence":"additional","affiliation":[{"name":"Mesosystem Investiga\u00e7\u00e3o & Investimentos by Spinpark, 4805-017 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0799-2335","authenticated-orcid":false,"given":"Hugo","family":"Almeida","sequence":"additional","affiliation":[{"name":"Mesosystem Investiga\u00e7\u00e3o & Investimentos by Spinpark, 4805-017 Guimar\u00e3es, Portugal"},{"name":"UCIBIO, Laboratory of Pharmaceutical Technology, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal"},{"name":"Associate Laboratory i4HB-Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,16]]},"reference":[{"key":"ref_1","unstructured":"Baki, G., and Alexander, K.S. 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