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Lactase is a protein that is naturally found in your small intestine. It helps break down lactose, a sugar found in milk and other dairy products, into smaller sugar units that can be easily absorbed into your bloodstream and therefore used as a source of energy for your body. If you are lactose intolerant, you have very low levels of lactase. As a result, you may experience common symptoms including diarrhea, abdominal cramps, and gas. For symptom relief, there are some over-the counter products and self- care measures you can try.
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