I am conducting an experiment for myself to try to confirm if it's actually true or just a myth. You know.. The pineapple juice experiment

I'm kind of a retard though, so I was wondering if anyone could answer a few questions for me
Such as: is Dole pineapple chunks in "100% pineapple juice" okay for this? I read on the back label that it has "concentrate" and I've never known what that means
Something like its from frozen fruit juice or something, if that's the case then does that ruin the enzymes or whatever it is that's supposed to actually produce the result? Idk anything anout that
I would just buy regular pineapple juice in a carton or whatever but I've been to 3 supermarkets and none of them had it
So I got Doles pineapple chunks in 100% pineapple juice in a can
But again.. Idk if the concentrate thing ruins it