That would not be recommended. It can't be easily predicted which constituents of each herb would "survive" the process and which constituents may be affected by the constituents of the other plant. In addition, if you make them separately, you can choose whatever ratio of herbs you want to mix. In the end, taking an extra step should allow you more flexibility.
Improve brain health. Rosemary oil is stimulatory to the central nervous system, and helps to promote clearer thinking. Rosemary has long been valued for its ability to help overcome mental fatigue, and to improve mental clarity and focus. Japanese researchers have recently shown that carnosic acid (one of rosemary’s phytochemicals) has neuroprotective functions in brain cells and may be helpful in the prevention of Alzheimer’s disease.6
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