Gluten is a generic term for a protein fraction present in many cereals. People with gluten intolerance (celiac disease) should follow a strict gluten-free diet.
But the problem is that gluten can be found everywhere, even in non-food products. For example, it is present not only in several drugs, but also in some cosmetics including lipstick and lip-gloss.
Since such products are applied on the mouth, they can be easily swallowed and enter the digestive system. No, this is not an exaggeration, because it’s been calculated that a woman swallows and absorbs an average of four pounds of lipstick in her lifetime.
So it’s better to read all the labels and check with your pharmacist first.