Source: https://www.amazon.com/Natural-Factors-Oregano-Certified-Servings/dp/B002KVGJ9S/ref=as_li_ss_tl?s=hpc&ie=UTF8&qid=1520467374&sr=1-8&keywords=Oil+of+oregano&th=1&linkCode=sl1&tag=golubkitch-20&linkId=0758d2436a21ab05a94a6a64bc62cc59