One fourth as sweet as cane sugar (sucrose) and non-fermentable by yeast. Use lactose when you want to sweeten a dry or bitter wine or beer. Also used to add sweetness and body to beers such as sweet stouts (milk stouts). Add a small amount, mix, and taste. Lactose can be added until desired flavor is obtained. There is no fermentation period or rest needed, so wine/beer may be bottled immediately. Add to hot water and mix thoroughly before adding to wine/beer. Add at end of fermentation, before bottling.