I have celiac disease, which affects absorption of fat-soluble vitamins. I was told the area damaged in small intestine affects which vitamins you can absorb meaning not all people with celiac disease have damaged area where vitamin A is supposed to be absorbed. I might be absorbing vitamin A now that my small intestine might be healed from a gluten-free diet. I also detoxed my liver while I was taking strong anti-fungal drugs. There may have been more than one factor affecting my lips. I don't know.