Does Beer Contain Gluten

Does beer have too much gluten?
Does beer contain both wheat gluten and has less gluten?? I just barley, gluten, so why beer has gluten in the first place?
Beer contains a number of gluten rates. Some of the big brands have started marketing Gluten – free beer and Redbridge for those who tolerate gluten again and want to drink.
Food Allergy Buzz: THRIVE ALLERGY EXPO