Anything that enters the bloodstream is quickly shared throughout the whole body (except the brain). Nothing is really targeted. When you take Advil, the chemical in it goes to all parts of your body, making your body feel less pain. You only really notice it in the spot that hurt.
WantAllMyGarmonbozia t1_iy4rmw8 wrote
Reply to ELI5: How can medicine or multivitamins target a specific part of the body when it's all consumed the same way? by shukii89
Anything that enters the bloodstream is quickly shared throughout the whole body (except the brain). Nothing is really targeted. When you take Advil, the chemical in it goes to all parts of your body, making your body feel less pain. You only really notice it in the spot that hurt.