Lactose question

[Iceman6409]

I am making a porter that calls for lactose and maltodextrin. Do I add these during the boil or do I wait until bottling?

 

[camonick]

Adding both late in the boil would be easiest and allow for sterilization rather than adding on the cold side where you would have to dissolve each in small amounts of water, heat, then cool before adding to your bottling bucket or keg.

 

[bobeer]

Adding in the last 5 minutes should do the trick.

 

[BrewMan13]

Weird that it calls for both; you could probably get away with one or the other, since both are unfermentable. But if the amounts aren't too crazy, you shouldn't have a problem.
I just did a milk stout and boiled the lactose for 10min.