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tldr; its rose scented oil.

Archive: https://archive.today/NVssV

From the post:

>There are many ways to boost brain power, from exercising more often to learning new skills. But what about boosting the actual size of your brain? According to a new study, wearing the right kind of perfume or cologne can enlarge your brain's gray matter. Researchers from Kyoto University and the University of Tsukuba in Japan asked 28 women to wear a specific rose scent oil on their clothing for a month, with another 22 volunteers enlisted as controls who put on plain water instead.

tldr; its rose scented oil. Archive: https://archive.today/NVssV From the post: >>There are many ways to boost brain power, from exercising more often to learning new skills. But what about boosting the actual size of your brain? According to a new study, wearing the right kind of perfume or cologne can enlarge your brain's gray matter. Researchers from Kyoto University and the University of Tsukuba in Japan asked 28 women to wear a specific rose scent oil on their clothing for a month, with another 22 volunteers enlisted as controls who put on plain water instead.

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tldr; its rose scented oil.

It's actually a specific rose scented oil. The type of rose is not provided which makes the whole article useless.