Stimulant ingredients like caffeine are popular and effective but some women can be too sensitive to caffeine. Leanbean fat burner seems a little low in green coffee extract and raspberry ketones, but that doesn’t mean this is ineffective all around — we were pretty impressed. The cost of the best fat burner without artificial ingredients comes to about $2 per day.Although egg yolks used to be avoided due to their high cholesterol content, whole eggs have actually been shown to help protect heart health in those at increased risk of disease . Research has shown that caffeine increases metabolic rate by an impressive 3–13%, depending on the amount consumed and individual response .