The topic of the thread is the supposed consequences of taking unclean or impure LSD, not fake LSD meaning entirely other unrelated compounds.
I get that for some people the difference may seem subtle, based on their experiences... but conceptually it is something completely different we have other threads for. Further off-topic posts will be unapproved.
I've never heard of such an "impurity". For a start it would need to incredibly powerful - a lot more powerful than LSD - in order to overwhelm the effects of a larger dose of LSD. I've not heard of any psychoactive drug thats far more powerful than LSD at smaller doses.
I think an answer to that has already been pointed to: it may not be that there is a separate impurity that can be singled out to have superpotent effects on its own. (Again I repeat we are talking about physical effects, and subjective difference that some kinds may be a 'bummer' is not necessarily the same as getting nasty physical side-effects.)
Maybe we need to look at it differently: the total amount of ergoloids is mainly what matters. Because LSD is so strong it forms the main part of potent effects on mind and body. But minute amounts of other ergoloids could mess with the pharmacological profile. LSD's actions may be a delicate thing that already have a wide range of possible outcomes (and yes amplified psychosomatic effects a la placebo are a part of this).
But we have too little information IMO to say that it is impossible that impure LSD might mean that the ergoloid impurities push the possibly delicate balance of LSD's pharmacology exceedingly towards the unfavorable.
That you and others have not heard of such a phenomenon does not prove anything. And that the other ergoloids on their own do not show potent effects is also not conclusive because they were not looking at factors of potentiation of vasoconstriction and unspecified nervous events and who knows what else may be the cause of the physical nastiness described from supposed unclean LSD. Absence of evidence is not evidence of absence.
I would like to see trials with LSD combined with the other ergoloid synth by-products that someone was nice enough to provide earlier in the thread. And a wide variety of permutations of these ergoloids at that.
If such trials are done in a double blind way and there can be not statistical significance seen regarding bad physical effects, then I am satisfied that the debate is done. Then I will be the first to say I was completely wrong suspecting such things. And IMO that is a proper and open scientific approach rather than making assumptions based on lack of certain observations within a limited perspective (i.e. effects of every compound by itself) and excuses based on the wideness of LSD's effect spectrum that it has already without the impurities.