Milk stout, also called 'cream' or 'sweet' stout, is a stout containing lactose, a sugar derived from milk. Because lactose is unfermentable by beer yeast, it adds sweetness and body to finished beer. Milk stouts have been claimed to be nutritious, and were marketed as such in the early 1900s with claims that would make the FDA wince. One ad read, "Ideal for nursing mothers, for the healthy, for the invalid, and for the worker." Surely!
Of course, we wouldn't stop at a traditional milk stout. Ours is double, an addition to our 2X line, and at 7.5% ABV is every bit as delicious as it sounds. To your health!