What Is the Current Regulatory Status in the U

What is the current regulatory status in the U.S. of ephedrine-containing dietary supplements?

A) The U.S. has banned the sale of all ephedrine-containing dietary supplements.
B) Supplements containing less than 10 mg of ephedrine are legal in most states but higher doses cannot be sold.
C) Supplements containing less than 30 mg of ephedrine are legal in most states but higher doses cannot be sold.
D) There are no restrictions for ephedrine-containing dietary supplements being sold.