Not in each commercially made atty in the world, but I know what's in the atties I use. I'm very particular about it.
Not all the exact ingredients, but I'm very particular about that too. I only buy from reputable juice makers who can actually provide lab certificates (and are members of trade organizations). I also I ask a lot of questions--on vendors' forums and via emails. If a vendor can't or won't cooperate, I don't buy from them. I also choose to avoid diketones and cinnamaldehyde in my juices. I don't buy juices that are very sweet, dark, and I avoid NETs. I prefer clean, clear, translucent eliquids that won't clog my coils. And I dilute most of them. I also vape unflavored.
I'm fairly certain that they are. The ones I buy (PG, VG and nic) come with lab certifications. I prefer UK-sourced bases because they were the earliest ones to offer said certifications and I have developed a taste for them.
Oh, but I do. And I can back it up. So can my vendors. And I expect the same candor and transparency from Aspire.