Why can't insulin be taken as a pill instead of injections?

Why can't insulin be taken as a pill instead of injections?

• A. Insulin cannot be manufactured in pill form
• B. Insulin is destroyed by gastric juices, rendering it ineffective
• C. Your health care provider decides the route of administration
• D. Your health care provider will prescribe pills when you are ready

Answer: (B)

Insulin is a protein hormone, so if you take it by mouth, the stomach’s acid and digestive enzymes would break it down into inactive pieces long before it could enter the bloodstream. That destruction means no active insulin would be available to lower blood glucose, making an oral pill ineffective. To work, insulin has to reach the bloodstream in its intact form, which is why it’s given by injections or other non-oral routes that bypass the digestive system. While there’s research into oral or inhaled forms, the fundamental issue is that gastric juices render oral insulin unusable. The other options don’t address this key barrier: the problem isn’t that it can’t be manufactured as a pill, nor is administration route determined solely by the provider, and pills aren’t prescribed simply when the patient is “ready.”

Insulin is a protein hormone, so if you take it by mouth, the stomach’s acid and digestive enzymes would break it down into inactive pieces long before it could enter the bloodstream. That destruction means no active insulin would be available to lower blood glucose, making an oral pill ineffective. To work, insulin has to reach the bloodstream in its intact form, which is why it’s given by injections or other non-oral routes that bypass the digestive system. While there’s research into oral or inhaled forms, the fundamental issue is that gastric juices render oral insulin unusable. The other options don’t address this key barrier: the problem isn’t that it can’t be manufactured as a pill, nor is administration route determined solely by the provider, and pills aren’t prescribed simply when the patient is “ready.”