The original post: /r/askscience by /u/Mindless_Studio_95 on 2025-03-10 11:43:08.

I’m making a transdermal solution that requires both 96% ethanol and an oil as the only two components.

Olive oil was chosen as it has the highest content of oleic acid of all oils and therefore the best penetration enhancing properties, but it stays on top of pure ethanol even after vigrously shaking the solution whereas MCT oil is perfectly mixed in ethanol.