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Brewers wanting to create authentic English-style ales...
Brewers wanting to create authentic English-style ales choose Danstar Windsor yeast to bring out...

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Adding Zinc

The questions I have are:

1) What is are the commercially available options available to the average homebrewer for adding zinc to yeast and of those, which are more available, affordable, and unlikely to affect flavor of the beer due to either the formulation or additives?