Garcinia Cambogia is a small, pumpkin-shaped fruit, sometimes called tamarind. Though native to Indonesia, it is also grown in India, Southeast Asia, and West and Central Africa. Adding this ingredient to meals is considered to be effective in making meals more “filling.” In some villages in Malaysia, garcinia is used to make a soup that is eaten before meals for weight loss because of garcinia’s appetite-blocking abilities.
The HCA extract from Garcinia Cambogia supplement aids in weight loss by doing two things: It helps to block fat, and it suppresses your appetite.  HCA blocks fat by inhibiting a key enzyme that your body needs to make fat from carbohydrates: Citrate Lyase.
Usually carbohydrates or sugars that are not used immediately or stored in other forms are converted into fats. When HCA inhibits Citrate Lyase, the fat-making process is halted and the production of LDL (bad cholesterol) and triglycerides decrease.
HCA also suppresses appetite by increasing serotonin levels. Serotonin is a neurotransmitter in your brain that makes you feel good. It’s a target of many antidepressant medications. Having low levels of serotonin may make you feel depressed or anxious; it drives many people into emotional or reactive eating. By increasing serotonin levels, HCA improves mood and suppresses the drive to react to stressful situations with food. As you eat less, your body senses this and it releases stored fat in your fat cells.
Many studies have shown promise. One randomized placebo-controlled study followed 60 obese persons for 8 weeks.
With a calorie-restricted diet (1200 kcal/day) and an HCA dose of 1320 mg/day, the experimental group lost an average of 14 pounds (compared to 6.1 pounds in the placebo group). The participants also noted reduced appetite.
When looking for a supplement, look for “Garcinia Cambogia” or “GCE” with at least 50% HCA