"Add 1/8 teaspoon per pint for a yeast starter, or 1/2 teaspoon per five gallons of wort." - http://www.midwestsupplies.com/wyeast-y … -5-oz.html
"That's interesting, slide 16 mentions the ideal is between .4 and 1ppm zinc in your wort. A while back I had an email exchange with Wyeast about their nutrient (actually about zinc toxicity and starter volume) and they stated, "Adding the nutrient [bc nutrient] at recommended levels will add 0.45 ppm zinc to your wort (that assumes 100% makes it into your fermenter). I read a journal article that reported toxic effects at 50ppm (a lot)."
Doubling recommended rate (i.e. 1 tsp) may be the best way to ensure that you're getting the minimum without exceeding the maximum 1ppm." - http://www.homebrewersassociation.org/f … c=10119.45
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