Yes I’ve some experience of zinc dosage.
You need to start on about 15mg, preferably in the evening and always with food. Stay at this dose for quite awhile until you increase.
I wouldn’t go much beyond 40mg without a bit of concern about your zinc/copper ratio.
As the review says I think, as haven’t re looked, is that it only really works if you are low in zinc, but then a lot of people are.
I was in about 30mg of zinc a year ago and my tinnitus was nowhere near as bad as it is now!
But I never realised then that it was considered to be a potential natural treatment for tinnitus.
I think, yet again, it’s something you have to feel out.
M x