You're still abusing Ritalin for weight-loss purposes? Girl, that shit is so 2006. Get with the program: the horse asthma drug program! Clenbuterol is the drug that Gatecrasher recently "blind"-itemly indicated that Hilary Duff uses to keep her figure trim. It's also what Rachel Zoe was rumored to be dosing her clients with. What is it, exactly? Well, according to the extensive research that we did by typing "Clenbuterol" into Wikipedia . . .

It's

a 2 adrenergic agonist with some similarities to ephedrine, but its effects are more potent and longer-lasting as a stimulant and thermogenic drug. It causes an increase in aerobic capacity, CNS stimulation, and an increase in blood pressure and oxygen transportation. It increases the rate at which fat and protein is used up in the body at the same time as slowing down the storage of glycogen. It is commonly used for smooth muscle relaxant properties. These mean that it is a bronchodilator, and tocolytic.

Translation: it makes you skinny! But be warned: it's not all fun and games and CNS stimulation. Like ephedrine, it increases the risk of heart attack and stroke, like, a lot. Also, do you really want to have something in common with Hil Duff (besides that one time with Joel Madden when you were sooooo wasted at MisShapes, obvs)? Anyway, just doing our public service thing. Please don't ask us about dosages now.

Horse Drug Gains Popularity As Weight Loss Pill [MSNBC]
Clenbuterol [Wikipedia]