Bouillion is not officially allowed, and of course LL won't want you to use it when they can sell you their version.
I have used Swiss Marigold during a previous stint on CD without any problems, and I think others on LL on here use it regularly. I'm actually supping on one now. I didn't really want to in my first week but I needed to tonight. It is only 2 tsps a day, not unlimited. I'm sorry but I don't know if the Just Bouillion version is the same, although I have had it in the past and the consistency is certainly not the same.
Although it costs more, I might buy the LL version because it's so easy to have a big tsp and still kid yourself you're only have a spoonful. If it's still the same, the LL version is individually portioned.