My impression is: "not really".
What the pellar and Keira are doing is playing their role. I think that for "magical healing" of any sort to work, both the magic-user and the recipient must have conducive physiology. (Sort of like witchers being mutants, which allows them to drink a Swallow Potion and not have their insides liquefy. Ditto with magic-users and healing spells. And that applies to things like love potions as well.)
So, "normal" humans and animals can probably be helped to a degree by magical healing, but it's probably better for the body to just heal itself. Less chance of unexpected side-effects. Conversely, if the individual in question is inherently magic, it's probably better for them to seek magical means of healing. For the love potion thing, I imagine it would have a more profound effect on sorcerers or sorceresses than on an average human.
I interpret the way the world works to be a division between two realities leftover from the conjunction of the spheres. There's "magic", which is the natural state of monsters and such, and then there's the "normal world", which is the natural state of human beings in our sphere.