Hard capsules are a type of pharmaceutical dosage form made from two pieces of gelatin or other materials. They are designed to hold powdered or granulated substances, making them easy to swallow. The outer shell is typically clear or colored, allowing for a visual indication of the contents inside. These capsules dissolve quickly in the stomach, releasing their contents for absorption. Hard capsules are commonly used for medications, dietary supplements, and vitamins, providing a convenient way to deliver precise dosages. They can also be manufactured in various sizes to accommodate different amounts of active ingredients.