[1] Matsui, M. S., Schalka, S., Vanderover, G., Fthenakis, C. G., Christopher, J., Bombarda Pinto, P. C., Bueno, J. R., Viscomi, B. L. I., & Bombarda Júnior, M. S. (2015). Physiological and lifestyle factors contributing to risk and severity of peri-orbital dark circles in the Brazilian population. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC4560538/
[2] Varani, J., Dame, M. K., Rittie, L., Fligiel, S. E. G., Kang, S., Fisher, G. J., & Voorhees, J. J. (2006) Decreased Collagen Production in Chronologically Aged Skin. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC1606623/
[3] Vrcek, I., Ozgur, O., & Nakra, T. (2016) Infraorbital Dark Circles: A Review of the Pathogenesis, Evaluation and Treatment. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC4924417/
[4] Ahmadraji, F., & Shatalebi, M. A. (2015). Evaluation of the clinical efficacy and safety of an eye counter pad containing caffeine and vitamin K in emulsified Emu oil base. URL:https://pmc.ncbi.nlm.nih.gov/articles/PMC4300604/
[5] Bravo, B., Correia, P., Gonçalves Júnior, J. E., et al. (2022). Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC10078143/
[6] Al-Niaimi, F., & Chiang, N. Y. Z. (2017). Topical Vitamin C and the Skin: Mechanisms of Action and Clinical Applications. URL: https://pubmed.ncbi.nlm.nih.gov/29104718/
[7] Zasada, M., & Budzisz, E. (2019). Retinoids: active molecules influencing skin structure formation in cosmetic and dermatological treatments. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC6791161/
[8] Boo, Y. C. (2021). Mechanistic Basis and Clinical Evidence for the Applications of Nicotinamide (Niacinamide) to Control Skin Aging and Pigmentation. URL: https://www.mdpi.com/2076-3921/10/8/1315
[9] Flament, F., Bazin, R., Laquieze, S., Rubert, V., Simonpietri, E., & Piot, B. (2013). Effect of the sun on visible clinical signs of aging in Caucasian skin. URL: https://pmc.ncbi.nlm.nih.gov/articles/PMC3790843/