Laila, I don't know much about Protocel 23 but here's the ingredients list...
INGREDIENTS: Protocel’s ingredients are a propriety blend of Tetrahydroxyquinone, Rhodizonic Acid, Sodium, Potassium, Croconic Acid, Triquinoyl, Pyrocatechol, Leuconic Acid, mineral and trace elements including Copper.
I would think using tea tree oil externally would be OK but don't take my word on it. What are you trying to treat with the tea tree?
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