yes you can use garcinia cambigia.
According to ayurveda, for treatmnet of obesity, you firstly stop causative factors from your life style. Like drinking too much cold water, eat too much sweets, day sleep, water after meal, lack of exercise, curd, menda etc. I will need your detail history. Till you can follow this
* start drinking hot water
* stop day sleep
* start any exercise in morning, like suryanamaskar, walking, joging, sports
* drink juice of turmeric n ginger with honey
* take jau barley, instead of ghenhu wheat.
* use cow ghee n milk only
* boild rise in open pot, don't use cocker. Withdraw water if rice