Columbia subject headings:
Dietary supplements--United States.
Drug approval--United States.
Ephedra--Side effects.
Food additives--United States.
Weight loss preparations--United States.
Harvard subject headings:
Dietary supplements--United States.
Drug approval--United States
Ephedra--Side effects.
Food additives--United States.
Weight loss preparations--United States.
Princeton subject headings:
Dietary supplements--United States.
Drug approval--United States.
Ephedra--Side effects.
Food additives--United States.
Weight loss preparations--United States.