[1] Naik, M. N., (2016). Hills and Valleys: Understanding the Under-Eye. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC4924416/
[2] Roh, M. R., & Chung, K. Y. (2009). Infraorbital dark circles: definition, causes, and treatment options. URL: https://pubmed.ncbi.nlm.nih.gov/19469797/
[3] Rahrovan, S., Fanian, F., Mehryan, P., Humbert, P., & Firooz, A. (2018). Male versus female skin: What dermatologists and cosmeticians should know. URL: https://doi.org/10.1016/j.ijwd.2018.03.002
[4] Shuster, S., Black, M. M., & McVitie, E. (1975). The influence of age and sex on skin thickness, skin collagen and density. URL: https://academic.oup.com/bjd/article-abstract/93/6/639/6670536
[5] Pilkington, S. J., Belden, S., & Miller, R. A. (2015). The Tricky Tear Trough. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC4587894/
[6] Sundelin, T., Lekander, M., Kecklund, G., van Someren, E. J. W., Olsson, A., & Axelsson, J. (2013). Cues of Fatigue: Effects of Sleep Deprivation on Facial Appearance. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC3738045/
[7] Rakova, N., Kitada, K., Lerchl, K., Dahlmann, A., Birukov, A., Daub, S., Kopp, C., Pedchenko, T., Zhang, Y., Beck, L., Johannes, B., Marton, A., Müller, D. N., Rauh, M., Luft, F. C., & Titze, J. (2017). Increased salt consumption induces body water conservation and decreases fluid intake. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC5409798/
[8] Goodman, G. D., Kaufman, J., Day, D., Weiss, R., Kawata, A. K., Garcia, J. K., Santangelo, S., & Gallagher, C. J. (2019). Impact of Smoking and Alcohol Use on Facial Aging in Women: Results of a Large Multinational, Multiracial, Cross-sectional Survey. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC6715121/
[9] Jacobs, L. C., Liu, F., Bleyen, I., Gunn, D. A., Hofman, A., Klaver, C. C. W., Uitterlinden, A. G., Neumann, H. A. M., Bataille, V., Spector, T. D., Kayser, M., & Nijsten, T. (2014). Intrinsic and Extrinsic Risk Factors for Sagging Eyelids. URL: https://jamanetwork.com/journals/jamadermatology/fullarticle/1876055
[10] Hamie, H., Yassine, R., Shoukfeh, R., Turk, D., Huq, F., & Moossavi, M. (2024). A review of the efficacy of popular eye cream ingredients. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC11175953/
[11] Herman, A., & Herman, A. P. (2013). Caffeine’s Mechanisms of Action and Its Cosmetic Use. URL: https://doi.org/10.1159/000343174
[12] Pullar, J. M., Carr, A. C., & Vissers, M. C. M. (2017). The Roles of Vitamin C in Skin Health. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC5579659/
[13] Papakonstantinou, E., Roth, M., & Karakiulakis, G. (2012). Hyaluronic acid: A key molecule in skin aging. URL: https://doi.org/10.4161/derm.21923