It is derived from a fruit of the same name, also called Garcinia gummi-gutta or Malabar tamarind.
The peel of the fruit contains high amounts of hydroxycitric acid (HCA), which is the active ingredient believed to be responsible for most of its weight loss benefits (1Trusted Source).

https://www.healthline.com/nutrition/garcinia-cambogia-weight-loss

L-carnitine is a chemical that is made in the human brain, liver, and kidneys. It helps the body turn fat into energy. L-carnitine is important for heart and brain function, muscle movement, and many other body processes. The body can convert L-carnitine to other chemicals called acetyl-L-carnitine and propionyl-L-carnitine. But it's not clear whether the benefits of these other carnitines are the same.

https://www.webmd.com/vitamins/ai/ingredientmono-1026/l-carnitine

Guarana is commonly touted for its ability to reduce fatigue, boost energy and aid learning and memory. It has also been linked to better heart health, weight loss, pain relief, healthier skin, lower cancer risk and a decreased risk of age-related eye diseases.

https://www.healthline.com/nutrition/guarana-benefits#TOC_TITLE_HDR_14

Like green tea, green tea extract is a great source of antioxidants. These have been credited with a range of health benefits - from promoting heart, liver, and brain health to improving your skin and even reducing the risk of cancer. What's more, many studies have looked at the ability of green tea extract to aid weight loss. In fact, many weight loss products list it as a key ingredient. Despite these benefits, it's important to know that green tea extract can also be toxic when taken in excess, so always talk with a health professional if you're interested in taking these supplements.

https://www.healthline.com/nutrition/10-benefits-of-green-tea-extract#_noHeaderPrefixedContent

Bitter orange (Citrus aurantium) is a fruit-bearing tree native to Asia. It contains an active ingredient called synephrine that is similar to ephedra.

https://www.webmd.com/vitamins/ai/ingredientmono-976/bitter-orange

Stevia, also called Stevia rebaudiana, is a plant that is a member of the chrysanthemum family, a subgroup of the Asteraceae family (ragweed family). There's a big difference between the stevia you buy at the grocery store and the stevia you may grow at home.
Stevia products found on grocery store shelves, such as Truvia and Stevia in the Raw, don't contain whole stevia leaf. They're made from a highly refined stevia leaf extract called rebaudioside A (Reb-A).
In fact, many stevia products have very little stevia in them at all. Reb-A is about 200 times sweeter than table sugar.

https://www.healthline.com/health/food-nutrition/stevia-side-effects

Irvingia gabonensis seeds might lower cholesterol because of their high fiber content. The fiber increases removal of cholesterol from the body. Some research suggests that Irvingia gabonensis seeds might also affect fat cells, which might reduce fat cell growth and increase the breakdown of fats.

https://www.webmd.com/vitamins/ai/ingredientmono-1252/irvingia-gabonensis

L-arginine is an amino acid naturally found in red meat, poultry, fish, and dairy. It is necessary for making proteins and is commonly used for circulation. L-arginine is converted in the body into a chemical called nitric oxide. Nitric oxide causes blood vessels to open wider for improved blood flow. L-arginine also stimulates the release of growth hormone, insulin, and other substances in the body. It can be made in a lab and used in supplements.

https://www.webmd.com/vitamins/ai/ingredientmono-875/l-arginine

Ginseng has been used for improving overall health. It has also been used to strengthen the immune system and help fight off stress and disease. There are different types of ginseng.

https://www.webmd.com/drugs/2/drug-60146/ginseng-root-oral/details

Astragalus is an herb that has been used in traditional Chinese medicine for centuries. It has many purported health benefits, including immune-boosting, anti-aging and anti-inflammatory effects. Astragalus is believed to prolong life and used to treat a wide variety of ailments, such as fatigue, allergies and the common cold. It's also used against heart disease, diabetes and other conditions.

https://www.healthline.com/nutrition/astragalus