Diammonium Phosphate - 2 oz (56 g)
When you need to give the yeast a little extra kick Diammonium Phosphate is just the right thing to do the job right. Typically used as an industrial fertilizer, this chemical compound has a very positive effect on yeast health and activity, especially when dealing with saturated or nutrient-poor mediums like white wines, high-gravity meads and beers.
It works great for yeast starters, especially when working with liquid yeast that needs proper nutrition before being ready for use, but can also be added to wort before pitching yeast for fermentation.