According to research, you need high concentrations of certain nutrients to notice benefits; vitamin C is one example. However, when taken orally, high doses of these nutrients cannot exert their benefits. This is because when you swallow them in liquid, capsule or tablet form, only a small amount of the nutrients are absorbed into the bloodstream; the rest of the nutrients are flushed out of the body. Also, some patients cannot absorb certain supplements in the intestines due to their health conditions. IV therapy may be advantageous for those who require high doses of nutrients to treat their health issues.