The catechins in green tea have been shown to inhibit the enzyme that breaks down norepinephrine so that its biological effects (e.g., increased metabolic rate, increased fat breakdown, etc.) are prolonged.

Garcinia Cambogia: The active ingredient in Garcinia Cambogia is hydroxycitric acid, or HCA, has boosted fat-burning and cut back appetite in studies. It appears to block an enzyme called citrate lyase, which your body uses to make fat. It also raises levels of the brain chemical serotonin, which may make you feel less hungry.

Cactus extract into your diet might also help you lose weight. It's naturally low in calories. It comes packed with dietary fiber that keeps you full so you're able to stay within your daily calorie limit. Eating cactus also boosts your calcium and manganese intake, and provides you with beneficial vitamin C.