These were the results of the 12 week study, which was published in The Journal of The American Medical Association (a highly respected scientific journal): Heymsfield, et al. 1998 As you can see, both groups lost weight.
But the group taking Garcinia Cambogia extract actually lost less weight (3. 2 kg 7 pounds) than the placebo group (4. 1 kg 9 pounds).