Evaluating the Pharmacokinetics of Oregano and Potential Oregano-drug Interactions Using a Drug Cocktail Approach

Inclusion Criteria: * Between 18-64 years old and healthy * Not taking any medications (prescription and non-prescription) or dietary/herbal supplements that can interfere with study drug pharmacokinetics * Willing to abstain from consuming dietary/herbal supplements and citrus juices for several weeks * Willing to abstain from cannabis/marijuana, hemp, and THC- and CBD-containing products for several weeks * Willing to abstain from consuming caffeinated beverages or other caffeine-containing products the evening before and the morning of the first day of each study arm * Willing to abstain from consuming any alcoholic beverages for at least 1 day prior to any study day and during the study day * Willing to use a secondary method of birth control that does not include the introduction or discontinuance of hormonal-based birth control (such as abstinence, copper IUD, or condoms). Specifically, regardless of the use hormonal-based birth control, a non-hormonal method should be used for the duration of the study and for three weeks following cessation of participation. * Willing to abstain from consuming oregano (as a food additive or otherwise) for the duration of the study * Geographically located within a 40-mile radius of Spokane and have the time to participate Exclusion Criteria: * Under 18 or over 64 years old * Taking medications or dietary/herbal supplements that can interfere with study drug pharmacokinetics * Have a major illness * Taking medication/supplements for a mineral deficiency * History of intolerance or allergy to oregano or any of the cocktail drugs (caffeine, dextromethorphan, losartan, midazolam, and omeprazole) * Use of cannabis/marijuana, hemp, and CBD- and/or THC-containing products within the last month * Currently using drugs or illicit substances for recreational purposes * Pregnant or nursing * Geographically located outside the 40-mile radius of Spokane and do not have the time to participate * Cannot read and speak English