Zinc is a co-factor for certain enzymes that assist with yeast growth and metabolism. Even at relatively low concentrations (0.2-2.0 ppm), zinc is said to have a noticeable impact on fermentation by allowing the yeast to work more efficiently during the growth phase, resulting in a quicker start and healthier fermentation, which ultimately leads to a cleaner tasting beer. While too much zinc can inhibit yeast growth, usage rates at the higher end of the recommended range are also believed to contribute to beer foam stability.
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