Egg white substitutes are perfect for recipes that call for extra egg whites.
One product that I like is: Liquid Egg Whites from Egg Whites International.
Egg Whites International's Liquid Egg Whites is all natural 100% pure liquid egg whites - USDA and it is Kosher approved. Their pure liquid egg whites are pasteurized, salmonella tested, and avidin neutralized. Pure Liquid Egg Whites are the purest form of protein known to man in the entire world and are 100% bio-available, which means none of the valuable Amino acids are wasted.
Although great for cooking, because the Liquid Egg Whites are completely tasteless and odorless, you can use them in place of water or milk when mixing your protein powders. Eight ounces of Liquid Egg Whites supply 26 grams of pure protein that is 100% bio-available so you only need to use half the amount of protein powder that you would normally mix with water or milk... your protein powders will last twice as long - saving you money.
Liquid Egg Whites also store very well. Opened containers of Liquid Egg Whites can be frozen for long term storage.