@MFernflower asked back in July whether CBNH and CBNP are compliant with the new Japanese rules and nobody picked it up, so, from Tokyo:
The honest answer is that the question can’t be resolved as asked, and that is the problem rather than a green light.
Two things about how Japan does this. Designated substances get added both as named individual compounds and as substance groups defined by structure. The ministry’s own notices carry titles like “one substance and three substance groups.” So being absent from a list of names means very little until you know the actual structure you’re holding. And I can’t find CBNH or CBNP defined as chemical entities anywhere outside vendor copy, while Japanese notices run on formal chemical names rather than trade abbreviations. If the structure isn’t pinned down, neither the regulator’s answer nor mine can be.
What is pinned down: CBN itself became a designated substance on 1 June 2026, written against products containing CBN, with no published concentration threshold. So if a CBN-derived material carries any CBN, that part is already settled.
The lead time is the other thing worth knowing. I checked three of the recent designation notices and each took effect ten days after publication. CBN was the unusual one at about two and a half months. So “not currently listed” is a status that can change faster than a shipment moves.
Not a lawyer, and I’m not sourcing anything for anyone here. Just answering the question that was asked.