118
Participants
Start Date
January 2, 2018
Primary Completion Date
July 4, 2019
Study Completion Date
March 31, 2020
L-Arg supplement
L-Arg supplement will be prepared as pills, administered 9g each day in 3 times for 2 weeks.
Placebo
Placebo will be prepared as pills (the same size, color and shape as of L-Arg), administered 3 times daily for 2 weeks.
Qinglongqiao Community Health Service Center, Beijing
Malianwa Community Health Service Center, Beijing
Shangdi Community Health Service Center, Beijing
Peking University
OTHER