Can I ask what effect you're looking for when taking together? The research show combined EO's with antibiotics can be synergistic, but also in some case will reduce the effectiveness of the antibiotic. There's not enough research as yet, but i haven't looked for your combo specifically. Eo's work better against gram + bacteria. Generally though, oregano is great but can be toxic if taken long term. Make sure you take breaks if taking longer than a couple pf weeks. People make a big deal about standardized carvacrol content.It's been shown that whole oils perform better than individual components. in the end a high quality product is the best way to go as there other phenolic compounds you want in there that are anti bacterial/ anti fungal which you may miss if they are just standardizing for carvacrol. I like the Gaia brand for quality.