The U.S. Food and Drug Administration (FDA) does
not regulate dietary supplements in the same way it regulates medicines. A
dietary supplement can be sold with limited or no research on how well it
Always tell your doctor if you are using a dietary
supplement or if you are thinking about combining a dietary supplement with
your conventional medical treatment. It may not be safe to forgo your
conventional medical treatment and rely only on a dietary supplement.
When using dietary supplements, keep in mind the following:
Like conventional medicines, dietary
supplements may cause side effects, trigger allergic reactions, or interact
with prescription and nonprescription medicines or other supplements you might
be taking. A side effect or interaction with another medicine or supplement may
make other health conditions worse.
Dietary supplements may not
be standardized in their manufacturing. This means that how well they work or
any side effects they cause may differ among brands or even within different
lots of the same brand. The form you buy in health food or grocery stores may
not be the same as the form used in research.
effects of most dietary supplements, other than vitamins and minerals, are not
known. Many dietary supplements are not used long-term.