A 22-year-old member asked:
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why does insulin have to be injected?

2 doctor answers
Dr. Kenneth Cheng
30 years experience Family Medicine
Broken down: Insulin, if taken orally, is rendered inactive because of stomach acids breaking down the insulin.
Answered on Sep 4, 2013
2
2 thanks
Dr. David Miller
9 years experience Family Medicine
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.
Answered on Feb 26, 2019
1
1 comment
7
7 thanks
Dr. Pavel Conovalciuc
22 years experience Family Medicine
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.
Jan 2, 2012

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Related questions:

A 65-year-old male asked:
Dr. Ryan Taylor
Specializes in Internal Medicine
Probably nothing : I assume it was given subcutaneously. This should pose no harm.
A 34-year-old member asked:
Dr. Susan Wingo
32 years experience Endocrinology
Too many variables: It would depend a great deal upon what type of Insulin you were using, how much you injected, and how sensitive your body is to insulin. Bottom line ... Read More
1
1 comment
A 23-year-old female asked:
Dr. James Ferguson
45 years experience Pediatrics
Basics: For you to bleed a little after an injection is not a problem. The insulin got in & will diffuse into the tissues to start its work.
A 37-year-old member asked:
Dr. Glenn Messina
34 years experience Aesthetic Medicine
Death: Diabetics lack or have low or poor quality Insulin so they supplement it with the injection. A non diabetic has their own Insulin that is working fine ... Read More

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