Is Carboxy and Zerona Effective?

I am thinking of doing a mix of carboxy and zerona. I have a decent amount of fat to get rid of (2 in on abs, 3 in on flanks). The woman who reviewed me said I would have to do cardio and a low carb diet. At first I was skeptical, because the diet n exercise alone should cut fat (I can never seem to flatten my belly through exercise), but she explained that these procedures would essentially force spot reduction, so all the weight I lost would be from that area. Is this true? Is it worth $2500?

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