Wondering about my gear that has no expiration date on it. I get my gear from a supplier who I think gets it from homebrew cause there's never exp. dates on the vials. He's never had issues with the stuff cause he uses it too and I'm on my second cycle through him and it's def workin for me.. So I guess my questions are how would I know if the gear is expired or is there even a way to tell? How long does gear usually last before it expires or does it depend on what it is?