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  1. Insulin: What It Is, What It Does, How To Take It & Side Effects

  2. Insulin - Wikipedia

  3. Insulin | Definition, Structure, & Function | Britannica

  4. About Insulin: What It Is, How It Works, and More - Healthline

  5. How Secreted Insulin Works in Your Body - WebMD

  6. Insulin: Function and types - Medical News Today

  7. Role of Insulin in Health and Disease: An Update - PMC