Can I take oregeno oil with grapefruit seed extract? (For a cold)?

I've been sick for the past few weeks and got treated for strep 2 weeks ago. I took my antibiotic and feel a lot better, but Im still achey all the time and a little bit sleepy. I have a follow up appointment next week, but I decided to go to the health food store to get some natural antibitoic type things. Anyways, my mom gave me grapefruit seed extract, and I bought oregeno oil pills. Is it safe for me to take these two together?