Have you heard about the Slimming coffee?

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Just now i have heard about this slimming coffee, my colleagues bought a few to try these things. They told me that it is very effective and proven because their friends and relatives had already tried the product. In a matter of one week they lost 10 kls. and i was amazed. My problem is if it's safe for a hypertensive person, is there a side effect? I want to try this product but i am afraid of what will be the effect in my health. Is it safe to use?