To be clear I said it was linked, there's not much research into FLmodafinil, unlike extensively researched modafinil, that would confirm this. However, I don't want be the guinea pig that finds out later this theory is accurate.
There's plenty of research showing how fluorine and associated compounds affect the brain, you can google "fluorine brain NIH" Here's one:
View attachment 288282
The purpose of this review is to attempt to outline the potential role of fluoride in the pathogenesis of brain tumours, including glioblastoma (GBM). In this paper, we show for the first time that fluoride can potentially affect the generally ...
www.ncbi.nlm.nih.gov
TLDR version. Fluorine is a "key" that allows substances to easily cross the blood brain barrier.
The second potential mechanism of damage is this:
When modafinil reaches the brain, only a small amount of the total ingested, it makes the cells related to processing information become more efficient, which causes them to consume more energy (glucose), producing more oxidative stress, however, this is countered by an equal rise in antioxidation processes protecting the brain (likely even more protective than is needed, effectively acting as an anti aging compound). Flooding the brain with much larger quantities of modafinil all at once may overwhelm the antioxidant mechanism and result in damaging inflammation.