Much like Leanbean, Instant Knockout also comes with a huge number of testimonials from customers all over the world, which has helping place it highly in our review of the best fat burners for women. Overall we feel happy recommending this as a top choice for the best fat burners for women. For us, Hourglass performed well when we reviewed the best fat burners for women. Several well-served thermogenic ingredients are included in this mix. This could help to boost your metabolism and increase calorie burn.