Being the experimental sort, & wanting to leave no potential parasite area uncovered, I tried some coconut oil in my nostrils. Nothing happened, except that not long afterwards I started to feel kind of congested and have continued to feel that way, with some light coughing.
Now that I think about it, it must be impossible to put coconut oil, or any kind of oil, in the nostrils w/o inhaling micro bits of it with each breath. Then, what about accumulation of such things in the lungs? Rhetorical Q.