What Vitamins Are in Beer?

A 12 ounce bottle of lager sports 0.75 grams of fiber while the same amount of dark beer boasts 1.3 grams. It Provides B Vitamins. That cold one has another hidden health benefit: it's a source of B vitamins such as folate, niacin, riboflavin, pantothenic acid, and vitamins B6 and B12.