Even though I haven't use any fat loss product before I would not say it's poison simply if it's poison then you won't see any on the market today.
I am not saying excercise and diet are bad but to lose fat little bit faster or to lose more fat you might need to take some supplement. My only advice for you before you take any fat loss product is to see an expert in the field see whether you need to take it or not or whether the product is good or not. If you do take a bad product it will hurt you more than helping you.
Hope this help
Single vitamin nutritionally supports the entire body!