A few points.
Eating endotoxin is no threat unless you have a compromised gut, as it can't cross that barrier into the bloodstream. We consume significant quantities every day.
We evolved to deal with it in food, it's everywhere.
Anywhere bacteria touches, it leaves behind endotoxin. Like a fingerprint. (or more like tracking shit on your shoes).
Injecting it is an entirely different matter, and large amounts can induce immediate reactions, while small amounts can be symptom free, while slowly contributing to damage, like accelerating arthritis.
Every injectable drug has some amount of endotoxin, including the most carefully made pharmaceuticals. That's how prevalent and difficult it is to remove. The FDA doesn't require anything to be endotoxin free, only placing maximum limits on how much exposure a patient is allowed in a certain amount of time.
But the beauty about endotoxin testing is this, regardless of whether one cares about the long term impact:
Everything that bacteria touches, even after sterilization(killing or removing live bacteria), leaves behind endotoxin. It can only be "deactivated" by very high heat.
Pharma must test for endotoxin, and UGL doesn't, resulting in a large gap between pharma and UGL production methods. Pharma knows they have to keep it out, because they can't remove it at the end. UGL only cares about sterilizing live bacteria out so acute infections aren't reported by users.
Pharma = ensure everything is sterile to the greatest extend possible to keep endotoxin out. From endotoxin free sterile ingredients to sterilized equipment, packaging, and production lab cleanliness. Filter sterilize at the end, Just as a safeguard the end product is sterile.
UGL = Use non pharma ingredients filled with contaminants, leave the raws bag open exposed to bacteria laden air. never sterilize equipment, use cheap containers and stoppers that are not endotoxin free, finally, at the end of this dirty, sloppy process. filter sterilize which is good enough to prevent a acute infections, and hides a multitude of sins.
But filter sterilizing won't hide endotoxin, which slips through .22um filters.
Endotoxin testing also detects live bacteria a bonus.
So in the end you get a number. EU/ml (endotoxins per ml).
Let's say you test 5 vials of the same compound from 5 labs. I'm certain you'll get wildly different results.
It's an insight into the lab's practices. Better than any "lab pic".
The lower the better. And when some lab's hidden carelessness and filthy production is revealed, they'll be incentivized to lower that number to compete.
Sterilize the equipment before brewing - EU will go down
Keep your raws sealed - EU will go down
Use pharma grade MCT, not the cheaper bulk stuff - EU will go down
Buy endotoxin free, or heat your own containers to deactivate endotoxin(which will also ensure they're sterilized) - EU will go down.
So as you can see, EU, whether you care about the cumulative, long term effects of endotoxins being injected (and you should), or not, one simple number, EU serves as a metric revealing the hidden lab conditions, ingredients, and other factors we wish we had insight into.
We could prime the pump by sponsoring the test of 5 (or more) vials of Test-C from the biggest vendors, and reveal who's operating a clean lab, and who isn't.
That single number could spark competition among gear sellers to be lowest EU, and therefore the cleanest, safest gear on the market.
Like dimer for HGH, this "clean lab score" could become an expected, mandatory test demanded by AAS buyers.