Essential oils are toxic for use on skin. The plants benefit from them different ways, as fungicides, anti bacterials, defence from being eaten by caterpillars or even bigger animals, insect repellants, war against other plants growing to close to them etc. In my thinking people dont take these warnings seriously enough.
Of course there will always be the odd ones trying everything out and stating "it didn't hurt me at all". I would stay away from putting essential oils directly on your skin and dilute them carefully with carrier oils if putting them in fragrances or other products. Never use essential oils another way than recommended. Some oils are directly contradicted by default, and only used in home-fragrances (never on skin), but even then they can have effects on the nervous system etc.
Thyme and sage can be used for human consumption in small concentrations, but we are not talking about the concentrated essential oils here, and putting those on the skin is not safe. Take care!
/ CMG
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