>>11601777 (Cont.) In other words, it's a mixture of substances that allow something to become a medicine, not just one 'substance'. These are additives are called excipients and have a range of functions. They can bulk up a really small dose, so that it would be easier to measure and administer (e.g. if it's too little to be pressed into a tablet). They can slow the rate of absorption, so that you don't experience any toxicity by overloading your organs. They can make a solution have the right PH, or to survive a certain PH environment. They can prevent spoiling of the drug. There are many more factors that I may be forgetting, but it's a very interesting topic that I'd recommend you research from reputable sources.
