So I found the page I printed of the Zelenko Protocol.
His preventative protocol advised 25mg of elemental zinc.
He only increases it to 50mg for those who get WuHuFlu and that's for 5-7 days.
Regarding the zinc depleting meds etc. I'll just add that my holistic dental book stated that processed sugar depletes zinc, Chromium, magnesium, and manganese.
In addition, from another source I don't recall which, drinking a glass of milk helps to counter zinc toxicity. The calcium and phosphorus being the main players.
Re: milk countering zinc toxicity
What do folks with dairy allergies do?