2.2. Study Design and Population
TCTR
DRY EYE
An 8-week, 3-arm, randomized, double-blind, placebo-controlled study was performed to determine the memory and dry eye improvement effects. This study was approved by Center for Ethics in Human Research, Khon Kaen University, Khon Kaen Province, Thailand (HE641120). The protocol was also registered with Thai Clinical Trials Registry (TCTR 20210316008).