A vitamin only helps if your body can use it. That simple idea is why the debate between oral supplements and IV vitamin therapy gets so much attention. One is easy to buy and take at home. The other sends nutrients straight into the bloodstream. Both can have a place, but they differ a lot in bioavailability, cost, convenience, and risk. This article is for general education only and is not medical advice. Vitamin needs vary by age, diet, health history, medications, pregnan