Ephedra seeds found in an ancient burial pit may be the earliest evidence yet for the medicinal use of plants.

Ephedra alkaloid content varied considerably among products. Total alkaloid content ranged from 0.0 to 18.5 mg per dosage unit. Ranges for (-)-ephedrine and (+)-pseu-doephedrine were 1.1-15.3 mg ...

In response to concerns about this substance, FDA has proposed mandatory warning labels on the packaging of products containing ephedra. [29] Unfortunately, the powerful dietary supplement ...