i'm actually surprised more people haven't responded to this.
first, for the average person, winny probably isn't necessary.
for a competitor, it's almost a mainstay for prep. i've seen doses all over the map. that being said, with winny, less is better and safer. it doesn't come without sides for most people which is why all the responses above, i'm guessing. if she's not a competitor, no need to use it.