A randomized, double-blind, placebo-controlled clinical trials (RCT) will be conducted to explore whether the FHP could relieve pain and protect joints. 200 participants suffering from KOA will be enrolled and treated with FHP or placebo for 1 month. The primary outcome measures are the Visual analogue scale (VAS), Western Ontario and McMaster university of orthopedic index (WOMAC), the Lequesne index, and MOS Sleep Scale would be measured from the baseline to 1 month. The second outcome measures would be the six minutes walking test, the Short Form 36-item Health Survey (SF- 36), the X-ray of both knees, and the adverse events from the baseline to 2 weeks, 4 weeks, and 12 weeks' follow-up. In addition, the VAS score, the WOMAC score, the Lequesne index, and AIS Sleep Scale from the baseline to 2 weeks and 12 weeks' follow-up are also the second outcome measures.