Chiewprasit, P., and P. Koonngam. “Comparative Effectiveness of Oral Astaxanthin Given Daily VS. Every Other Day on Skin Elasticity: Randomized, Double-Blind Cohort Research”. Journal of Basic and Applied Pharmacology, vol. 2, no. 1, June 2022, pp. O26-36, https://li01.tci-thaijo.org/index.php/JBAP/article/view/253998.