Qingdao Sigma Chemical Co., Ltd (International, US, EU, Canada and Australia domestic

It's rare but happens, and could happen again. The "hair" is generally fibers from a filter on QSC's side.

Some people filter all oils they get, which I think is overkill, but to each his own.

I've never had anything suspicious in any QSC oils, but if I did, I'd just filter it and move on with life.

I'm not the most gentle with my gear, and after a few injections, I invariably end up with some stopper cores floating around. I haven't been able to draw any of them into my syringe, so I don't worry about them either.

TLDR; always put your oils (from anyone) in front of a light and look for anything weird before injecting. If you see something, filter it out with a 22um PTFE filter.
Use your iphone camera light and sit the vial on top, it shines everything
 

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