Hi Nisloo,
Are you referring to a prehopped can when you say "lager liquid malt extract" or can can of malt specifically for lagers?
Ultimately the addtion depends on the recipe and intended style. If referring to a can of prehopped goo then a small percentage of dextrose may be a common addition to lighten the body of the beer
Cheers,
Lodan
BTW might be best to post this is the kits and extract section next time
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