Jerms,
For what it's worth, none of the five Ahlusion juices I have lists an expiration date on the label, and I don't see one printed directly on the brown bottle. Has Ahlusion stated that their juices have a six-month shelf life?
I've used the term "reverse-steeper" in numerous posts, but I intentionally didn't use it in my posts today. My intention was mostly to share how sad I was to witness the diminishment of such a superb juice while the bottle remains half-full. I'm not even complaining, since I agree with you that natural flavorings tend to degrade much, much faster than synthetic, lab-based flavorings. (I still have some Dekang synthetic tobaccos from 2010 that remain three years later about 90% of what they were when new---I don't vape those either, LOL). I don't know if it's inevitable, but the demise of natural ingredients over time does seem pronounced.
My BGB was amazing for about 3-4 months. Then I noticed it starting to lose oomph. The only time I vaped it by itself was before adding some BGB to other tobacco juices to give them a boost or invigorate them, so I often had the "My, how you've grown!" experience (or in this case, "My, how you've shrunk!"). About six months in, I stopped Frankenjuicing with BGB because it had tamed to mere house cat status from the imposing (and dangerous) tiger it had been originally. "RIP, BGB, we hardly knew ye..."
None of this is to be taken as a criticism of BGB or Ahlusion. Blue Grass Burley remains for me the Gold Standard of NETs, the one that set the bar's current upper limit. The fact that I wasn't in love with the juice and didn't vape BGB much by itself is incidental and not relevant to my judgment. Whether I like it or not, I know a superlative NET when I vape one.