A. No, I have not come across that. And I never will. This kind of detox belief is common in massage, where there’s some justification for it. Even though the idea of “releasing” or “flushing” toxins is always a misleading, fear-mongering oversimplification, post-massage soreness and malaise (PMSM) is a genuine clinical phenomenon. For more information about that, see Poisoned by Massage: Rather than being DE-toxifying, deep tissue massage can probably cause a slightly toxic situation in the body.
But there is not even a scrap of a smidgen of biological rationale for spinal manipulation causing any malaise due to freeing a “toxin buildup.” Spinal joints are not a repository for “toxins,” and even if there were — a ridiculous premise, but accept it for a moment — there’s no way that some spinal joint wiggling would set them loose to run amok in the bloodstream. Spinal manipulation is not that different from normal movement!
This idea is indeed “super fishy.” Utter bollocks, in fact.