I've been working out for about ten years, and in that time I have tried a lot of supplements.
I like to use a fat burner when I'm dieting and shredding down for summer. The fat burner doesn't do the job by itself; it just makes the dieting and the cardio easier. It makes the whole process less of a chore.
Instant Knockout is one of the best that I've used. The glucomannan stops me from being so hungry, and the caffeine, green tea, and cayenne give me the extra energy that I need to work out.
Bottom Line: Yes, I would recommend this to a friend
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