Natural magic is quite interesting. It uses things that grow out of the Earth and the ingredients aren't processed/pre-made. To make a natural potion/serum/whatever it may take more time but it is worth it.
But me and maybe even me only, but I think that if the only process its been through is cleaning, it's still natural, such as most honey. On the other hand, artificial magic simply drives me crazy, as If all the ingredients have been processed 100% and it kicks the naturalness out the door. Although, some magic uses both. Like maybe a potion requires both artificial and natural ingredients.