Pongchaichanon, Pimlada, Pimlada Pongchaichanon, Chutiwat Yuthong-in, Lakkana Ramwong, Jenjira Sukcharoenjit, Kaemanun Joomthong, Theeraphong Sangangam, and Witoon Youngsa-ad. “Efficacy and adverse effects of Phyllanthus emblica combined with Andrographis paniculata syrup versus brown mixture for symptomatic cough relief in Long-COVID patients: A single-blind randomized controlled trial”. Health Science, Science and Technology Reviews 19, no. 2 (August 27, 2026): 55–67. accessed August 30, 2026. https://li01.tci-thaijo.org/index.php/journalup/article/view/270665.