Then the substances are tested in animals.
The substances are banned year-round by the World Anti-Doping Agency.
The substances are nevertheless active in test-tube experiments against H.I.V., he says.
I'm relieved that some of the substances are going off the market.
Once made, the substances are easy to disperse, highly toxic, and have rapid effects.
The substances are often found in the recycled plastics first used in electronic products.
But how does one forge a career as a guide when the substances are illegal?
No one has proved that the substances are dangerous to humans, and Ms. White's daughter, Katelyn, is thriving.
"You have to remember," he says, "that the substances are still illegal; it is the consequences that are different".
The substances are closely linked: chemically, they are similar, and in the body, L-tryptophan is converted to 5-HTP.
Enantiomers exist when the molecules of the substances are mirror images but are not superimposable upon one another.
