It is my belief that if a product is a.) sold through a pyramid scheme, b.) surrounded by litigation, c.) internationally associated with liver damage* then its terrible for the body and a drain on the wallet.
You'd be better to clean up your diet and work out consistently. Even if it did work, do you really want to risk another Fen-Phen?
*Scientific studies in 2007 by doctors at the University Hospital of Bern in Switzerland and the Liver Unit of the Hadassah-Hebrew University Medical Center in Israel found an association between consumption of Herbalife products and hepatitis. 
My mother bought like 300euro worth of their crap! I looked at the ingredients and showd her, how she could buy exact the same capsules for 5$ on iherb.com.
she almost died. The products are crazy overpriced. Plus she eventually stopped using them (because she isnt a consistent person). So now there is like 200euro worth of cheap herbs laying around our house....
The side effects of allergy medications keep some people from using them. Natural remedies can be a great alternative, but some are more effective than others.