Mist kits usually range in alcohol content from 6.5 - 8 percent. Some people like to increase the alcohol content for various reasons. For example, you may want to add ice or fizzy water to the finished product and still maintain the strength you desire.
Mist booster will increase the alcohol content of your favourite mist kit by 3+%. (This is the highest you should raise it, if you don't want to negatively effect the flavour.)
Mist booster is a blend of invert sugars that won't impact the flavour balance negatively like other refined sugars can. It is the same kind the manufacturers use in production.
Easy instructions on the label.