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Background:Fatigue is a common symptom both in diseases status and in healthy subjects.Various supplements and nutraceuticals for relieving of fatigue have been used.However,there are a few studies to evaluate the efficacy and the safety of the drug for fatigue alleviation,we conducted using URSA Complex to evaluate the efficacy on physical fatigue via score changes in the checklist individual strength (CIS).Methods:The study was designed as a multicenter,randomized,double-blind,placebo-controlled trial,with subjects randomized to one of the two arms,receiving either placebo or URSA Complex administered as identical capsules.The primary efficacy endpoints of this clinical trials are the ratio of improving CIS scores ＜ 76 points in patients at the end (4 weeks).Secondary efficacy variables are as follows one is an improvement of fatigue and the other is an improvement of the liver enzyme.Results:The fatigue recovery rate in who had improved CIS scores of＜ 76 points were 70.0％,50.9％ in the therapy group and placebo group,respectively (P =0.019).The fatigue recovery rate in CIS score was higher in URSA Complex therapy group than placebo group.The difference between therapy group and placebo group was statistically significant at 4 weeks later,but not 2 weeks.Conclusions:Our results provided that the URSA Complex was effective in alleviating physical fatigue.The adverse event frequency in the therapy groups was similar to that in the placebo group.