## 5 Conclusions  
This study has indicated that the emblica toner is safe and has anti-sebum efficacy on facial skin. Moreover, the model of anti-sebum efficacy evaluation applied in this study, adding nontreatment (unwashed skin position) and control treatment (only-washed skin position) to the middle of the forehead using a split-face method, makes it possible to compare the sebum levels at the same time and reduce the impact of confounding factors, and then calculate the anti-sebum efficacy on the facial skin from the area under the curve of the sebum recovery on each designated position with different treatments. As a result, this research may give an overview of study of anti-sebum efficacy on facial skin under controlled conditions in order to be useful for further study. Conceptualization, and methodology, T.T., P.T., C.C., D.N. ; formal analysis, data curation, T.T. ; writing--original draft preparation, T.T. ; writing--review and editing, B.S.S., C.C., D.N. ; supervision, project investigation, C.C., D.N. All authors have read and agreed to the published version of the manuscript. This project was partially supported by Suan Sunandha Rajabhat University, Bangkok, Thailand and Chiang Mai University, Thailand. The authors would like to thank all of the volunteers for their collaborations. The authors declare no conflict of interest. [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] A Preliminary Investigation of The Impact of Oily Skin on Quality of Life and Concordance of Self-Percieved Skin Oiliness and Skin Surface Lipids (sebum). _Int. J. Cosmet. Sci._**2013**, _35_, 442-447. [CrossRef] [PubMed]
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