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Copyright © 2014 Hamed Soleyman Dehkordi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 58 Hamed Soleyman Dehkordi et al. Common thyme with scientific name Thymus vulgaris is one of the Iran indigenous plants that exist widely in southern and central regions of country. This plant has medical applications in traditional medicine including antibacterial and antifungal activity affecting gastrointestinal and chronic diseases. All Thymuses are rich in terms of volatile compounds and mainly consist of thymol and Carvacrol that are considered as strong disinfectants. With regard to valuable properties of common thyme, we decided to investigate effects of Zataria multiflora bosis alcoholic extract on some components of Complement system (c1inhibitor, CH50, C3, C4) and serum IgM in rat. In this research two treatment groups were fed with Zataria multiflora bosis alcoholic extract at dos