Final answer:
Traditional gelatin capsules are made from animal collagen, but alternatives exist that are not animal-derived, including vegetarian capsules made from plant materials or synthetic polymers.
Step-by-step explanation:
The material used to make capsules and gelatin capsules is not exclusively of animal origin. Traditional gelatin capsules are typically made from collagen derived from animal tissues. However, there are also alternatives available for those who prefer non-animal sources. For instance, vegetarian capsules are made from cellulose or other plant-derived materials, while others may use semi-flexible polymers or polymer gels for the encapsulation of pharmaceuticals.
While some medications, such as aspirin and codeine, are derived from plants, capsules can be made using a variety of materials, including synthetic and semi-synthetic substances. This addresses concerns related to dietary restrictions, ethical considerations, and the availability of animal products for manufacturing. Researchers continue to explore materials sourced from nature and synthetics that provide the desired properties for drug delivery while being suitable for different consumer preferences and needs.