The 17,000% comes out to about 1 mg from reading a bottle I have.
The daily amount of 100% b12 is then 6 mcg.
There are lozenges that are 5 mg or 83,333% of the daily value or 830 times as much.
I tried the 1mg lozenges and nothing happened, at least I would have liked to get the placebo effect for my money.
So many times popular ingredients will be put in to attract customers more than if it really works.