6 doctors weighed in:
Why does insulin have to be injected?
6 doctors weighed in

David Miller
Family Medicine
3 doctors agree
In brief: Inhaled
Inhaled Insulin is possible and has been played with.
However, the product released was horribly expensive and never took off. There are talks that it might be re-introduced. Here's a link. http://diabetes.webmd.com/inhaled-insulin.

In brief: Inhaled
Inhaled Insulin is possible and has been played with.
However, the product released was horribly expensive and never took off. There are talks that it might be re-introduced. Here's a link. http://diabetes.webmd.com/inhaled-insulin.
David Miller
David Miller
Answer assisted by David Miller, Medical Student
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1 comment
Dr. Pavel Conovalciuc
insulin is extensively degraded by the liver, so if taken in pill form, it must pass through the liver once absorbed from the guts. That way >80% of it will be destroyed, so it will render the formulation ineffective. Therefore, it's been given by injection which requires no liver pass and inhaled formulations are being developed.
Dr. Kenneth Cheng
Family Medicine
3 doctors agree
In brief: Broken down
Insulin, if taken orally, is rendered inactive because of stomach acids breaking down the insulin.

In brief: Broken down
Insulin, if taken orally, is rendered inactive because of stomach acids breaking down the insulin.
Dr. Kenneth Cheng
Dr. Kenneth Cheng
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