At the present time,insulin must be administered by parenteral (non-oral)routes because

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Quizplus · Accepted Answer

Insulin is a protein, and if taken orally, it would be broken down by the digestive enzymes in the stomach and intestine, similar to any other protein we consume. Therefore, it cannot be absorbed effectively through the gastrointestinal wall to exert its effects. The primary reason it's administered through parenteral routes (such as injections) is because the insulin molecule is too large to be absorbed through the gastrointestinal wall, not because it irritates the stomach or due to first-pass metabolism in the liver.

At the Present Time,insulin Must Be Administered by Parenteral (Non-Oral)routes