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 ...

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