It does, sometimes less, sometimes more but generally it somehow does. Sometimes, when I forget it to take it before my work in the morning I can see a difference. I have two Tinnitus, one high pitch, pretty much all the time (except in the morning when I woke up) and one low hum, which wasn't all the time. Now the the high pitch one I've got it in November, but the low hum one I've had it for a year or so, but it wasn't so bothering. Anyway for a last week or so it has been diminishing hugely, which is great. I don't know if that's CDB job, because I'm taking also nasal spray to clear my Eustachian tube. But generally, since I'm taking CDB the high pitch it also less annoying and it seems I'm making slow progress, it's a little bit quieter compared to beginning.
Also, for some years I've had trouble sleeping, usually about twice a month, after about four hours sleep I was waking up and couldn't sleep anymore for an hour or two, and only after that time when I felt tired again I was able to get some more sleep. But since I'm taking CDB it hasn't happen even once, and actually a lot of people say it helped them with the sleep.