All of the following statements concerning drugs and supplements are true except: a. many drugs and supplements are ineffective and expensive. b. many supplements and drugs are frequently used to improve performance and appearance. c. supplements and drugs both undergo stringent government testing. d. supplements and drugs can both cause unwanted side effects.

Insulin is a peptide therapeutic used to manage type 1 diabetes, which affects more than 20 million people worldwide according to the international diabetes federation. a significant limitation to the broad distribution and use of insulin to treat type 1 diabetes is the fact that it must be administered by injection rather than orally. why is insulin administered by injection and not orally?