Thieves totally works for a cold. I use it in my diffuser and on my chest and neck. I would highly recommend using it with a carrier oil though, as it is quite potent and can feel like it's burning your skin otherwise. I would definitely recommend diffusing thieves when you feel the onset of a cold.
I was told by a friend to ingest 2-3 drops of this stuff with some water when I felt a little under the weather, and antibiotics were not helping. Lone and behold I was cured. I was curious one day when I had a cold sore, I applied a drop of the Thieves Oil directly onto the cold sore, and It literally was 50% better by that night, and gone in 2 days.. Now I apply it when I feel the tingle and I dont even have the cold sore appear.. It also seems to keep my immune system stronger by simply diffusing it. It is a tad pricey but honestly, I couldnt live without it.
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