Excipients are various synthetic fillers used in making many nutritional or "natural" supplements. They are added to give the desired consistency or form for making tablets. Tablets cannot be manufactured without the use of excipients. Some common excipients are binders such as hydrogenated oils, fillers such as talc or corn starch, lubricants like magnesium stearate, and coloring and flavoring agents such as fructose or malt dextrose. Very few companies claim to make excipient-free supplements that are also hypoallergenic - important because when used over a long period of time, one can become sensitive or even allergic to the additives in their supplements!