I'd want to see how the name brands test first. Maybe our expectations are too high? If the name brand is supposed to be sterile then that's the standard we should be going for. But if name brand fails sterility ...
Also, one passed test doesn't mean the whole batch is sterile anymore than one failed test means the whole batch is contaminated. If a blood culture comes back positive you ALWAYS have to repeat for confirmation because the most likely scenario is that you contaminated the sample during testing or collection and the results can't be repeated.
Similar to the group testing when 10 people send in samples from the same batch. All 10 samples will show a difference in dosage and purity. One vial doesn't tell you correct numbers for the whole batch. That's why
@Bacchus says it's not exactly reliable to go off the "overfill" of one tested vial.
At the end of the day it's personal risk and comfort. If you're healthy with no additional health risks you're *probably fine*. If you have a compromised immune system you need to weigh your risks. I've used the same lancet needle for DAYS to check my blood sugar. That's NOT the best and safest practice. Best practice is using a new one for every poke.
I don't know if I'd pay more for sterility testing because I don't know what the results would change? I'd be more inclined to pay more if we got results for multiple vials from the same batch- both regular testing and sterility.