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Lanolin, cera alba and linalool
So this hair product I've been using contains the three ingredients above. Turns out lanolin is wool grease secreted by sheep glands, cera alba is beeswax and linalool is a perfumed plant extract sometimes coming from fungus. I'm probably allergic to all three, no wonder my head is itchy.
WOOL GREASE SECRETIONS. Also used in Nivea face cream. :-(