A: You can mix singles, and you can mix a blend with a single, but it is a “rule” not to mix blends with other blends.  Mixing them together is going to change the frequency of the oil and it may not have the same results as they would if you did them individually.  It is, however, okay to layer them.  The oils absorb into the skin rapidly so you can put an oil on top of another oil.  Some like to wait a few minutes in between or apply it to another part of the body (a vita flex point, perhaps?)

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