White Labs | WLN3200 Servomyces Yeast Nutrient

Servomyces is a nutritional yeast supplement (GMO free) that was originally developed for German brewers by Weihenstephan and Munich University. It conforms to the restrictions of Reinheitsgebot. Servomyces enables any yeast strain's ability to incorporate essential nutrients into its cellular structure.
Tested in breweries around the world, it has been proven to:

Cuts down fermentation time
Increase flocculation
Greatly reduce harsh sulphur notes
Improve the health and viability of yeast
Reduce levels of diacetyl at the end of primary fermentation
Produce faster, more complete attenuations
Increase yeast production for a better harvest
Improve the quality of the finished product

For homebrewers, Servomyces is available in blister packs of six capsules, each of which can be used for a 5-gallon batch (20 to 25L). Servomyces is beneficial to beer, wine, mead and cider. (Homebrew notes: Add 1 capsule 10 minutes prior to the end of the boil. OR, If your fermentation does not require a boil, open the capsule and pour in the Servomyces, since the capsule requires boiling to melt).
Source: White Labs