Participants and Methods: A randomized, single-blind, controlled trial was conducted with 60 female undergraduate students, aged 18 to 25 years, residing in Ho Chi Minh City, who exhibit symptoms of Premenstrual Syndrome (PMS) were eligible for inclusion. Participants were required to meet the inclusion criteria and not fall under any exclusion criteria.

Participants were randomly assigned into two groups in a 1:1 ratio: the intervention group received auricular acupressure using Cowherb seeds (Wangbuliuxing seeds) applied to specific acupoints, including Shenmen (TF4), Sympathetic (AH6a), Endocrine (CO18), Liver (CO12), Kidney (CO10), Subcortex (AT4), and Zero Point, while the control group received a sham treatment. The sham treatment involved a patch of similar size to the Cowherb seed patch but without any active ingredients, applied to the same acupoint locations as the intervention group.

Both groups were provided with instructions on lifestyle changes to help manage PMS symptoms. The intervention lasted for 8 weeks (2 menstrual cycles), with weekly patch changes alternating between the left and right ears. PMS symptoms were assessed using the Premenstrual Symptoms Screening Tool (PSST), and quality of life was measured using the WHOQOL-Bref scale. Data were collected at baseline, after 1 week, and after 8 weeks. Adverse effects were carefully monitored throughout the study period.