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Yeast nutrients

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Nitrogen - Nitrogen is used in the creation of new yeast cell walls.

Oxygen - Oxygen is needed by the yeast during the initial fermentation to grow rapidly.

Micro-nutrients - Various elements and amino acids needed by the yeast. These would be things like phosphorous and citric acid.

[edit] Beer Yeast Nutrient additives

Wort typically has enough nutrients that adding nutrients is not done.


[edit] Wine and Mead Nutrient additives

Wine and mead typically do not have enough nutrients on their own to produce a good end result.

DAP - Diammonium Phosphate

Fermax

Fermaid

Yeast Hulls

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