This was actually the primary reason why I never bought it from Amazon.
It's a bit of a comical question in hindsight but on .com/.org I asked where people bought their BAC water because I was worried about contamination and a LOT of people told me Amazon. I even remember responding to those DMs saying I was worried about growth inside of the vial, etc and they told me it was fine in their experience, but I was still too nervous about it so I never bought it from Amazon.
However I do buy my needles from Amazon, which was also a bit hard for me to do in the beginning because I wanted to go to a medical store irl to get it but a lot of places wouldn't sell it to me without some prescription (?), I guess they thought I was using it for drugs or they're aware of the rise of peptides or something. But I found some good needles on Amazon I'm okay with using. Most complaints about the needles are the fact they're blunted anyways not that they're unsafe or that they break off.
But because I buy my needles there I will occasionally check for other peptide supplies out of curiosity and one day I noticed a majority of the peptide supplies were gone. Because I knew people bought their BAC water there that's why I asked about that specifically.
Kind of glad they're gone now, anyone who injected themselves with the BAC water from Amazon is living their life moment to moment I guess lmao.
BAC water is extremely cheap though I spend $1 per 10mL vial, and most suppliers will provide it alongside your purchase of something else.