08/27/2026
Have you ever wondered what actually happens inside your body when you receive an IV compared with taking an oral supplement?
An IV infusion enters a vein and immediately joins your circulating blood. From the arm, it travels to the right side of the heart, moves through the lungs, returns to the left side of the heart, and is then pumped into systemic circulation for distribution throughout the body.
Because the contents of the IV are delivered directly into the bloodstream, IV administration is considered 100% bioavailable. This means the full administered amount reaches circulation. It does not mean your body will use, retain, or benefit from 100% of it.
Oral supplements take a different route. After being swallowed, they pass through the stomach and are absorbed primarily through the small intestine. The amount that reaches circulation can vary based on the supplement, its formulation, food intake, digestive health, and interactions with other substances.
Once something reaches your bloodstream, your body still has to distribute, use, store, metabolize, or eliminate it. Those processes depend on the specific substance, the dose, and the individual.
That is why faster or more complete delivery does not automatically mean greater benefit. Every IV should begin with a proper clinical assessment to determine whether it is appropriate for that person.
Did you know the routes were this different?
