I bought a Groupon for 4 weeks and decided to give this a try as I need to lose 40 pounds by June. I started the beginning of March. The initial visit takes a while because you have to see the doctor and then get weighed in. They give you Phentermine and other speed supplements, and a B12 shot. They give you a list of healthy foods and a diet plan. The first week I lost 4.8 pounds. I didn't sleep and I felt awful from the pills. The second week I decided to only take 1 of the pills and see how I did. I only took the Metablast before my workout, and I still lost 3.3 pounds. The third week I only lost 1 pound. I have been jogging/walking at least 2 miles every day. My diet consists of lots of protein, veggies, and fruit. You can't have any pasta, bread, etc. for the first 3 weeks. I haven't taken any pills and this week I lost 3 pounds. You can do this diet without the pills that are horrible for your heart and you can get a B12 shot at any walk in clinic for $10. The staff has been very kind and actually listen to you. I do like getting weighed in and being accountable for my progress. I would recommend to try it for at least a week and see how you feel. If you get the Groupon, it's cheap enough.