What should I do?

Well I am having a struggle with what to do. All this time I have been keeping a food journal and keeping my calories low. Exercising like crazy. No diet pills..Well my aunt Cindy sales Herbal Life products and they have come out with a weight loss powder you add to your meal shakes. It is getting great reviews and the best part is its money back guarentee. I am really torn on whether to try it. For one I feel my hormones are finially getting stable and what will this product do to them, but on the other hand if this works and I could get the weight off much faster. Plus , Cindy knows me, she knows I would do it right. So if it doesn't work I can get my money back. Its not cheap either. If I decide to get it, it will be the most expensive weightloss product I have bought. Its like $100. I need to check with her to see how much weight the guarentee covers, cause if I spend $100 I better get my moneys worth. I don't want to lose 5 pounds and that be it. I am going to talk with her about it this morning , we are going to go walk out at the KOA.