Before choosing a beer based on the level of gluten it contains it is best to speak with your doctor to find out exactly why gluten bothers your stomach. Some beers do have lower levels of gluten in them than others that may be possible to drink in small quantities for people with a mild allergy to gluten. Even those with mild allergies to gluten may find that gluten of any kind in their drink causes serious discomfort as drinks lack the bulk of other foods that have gluten. The smallest trace amounts of gluten can cause serious, life threatening reactions to those with Celiac disease, however. Beers that are clearly labeled gluten free are your best bet if you are unsure of what causes your gluten reaction.