Their website is here .
A friend of mine sells Herbalife products and I have to say I wouldn't touch them with a bargepole. Their sales tactics seem to be to find a few people willing to try their products, and then push and push those people to buy more and more. My friend claims to have lost over 4 stone using the products she then went on to sell, but she didn't - she has always been slim, but has to lie to satisfy the company brief and get people interested in the product.
She sells tablets and meal replacements - the meal replacements are like Slim Fast but taste worse and cost more. I don't know about the tablets but seeing as how they only work as part of a low-calorie diet I feel their claims are dubious.
My advice would be to steer well clear ... sorry.