All that being said, garcinia cambogia seems to be very safe for otherwise healthy individuals and the risk of toxicity is extremely low. Bottom Line: Commonly reported side effects of garcinia cambogia include headaches,dizziness, dry mouth and digestive problems like diarrhea. Should You Try Garcinia Cambogia? According to the studies, garcinia cambogia can have modest effects on weight loss. It may help you lose about 2 more pounds over a period of several weeks. However, same as with most weight loss supplements, it isn’t very effective on its own. You also have to eat healthy, exercise and sleep well. Additionally, if you want to lose weight and keep it off, then you have to change your lifestyle for the long-term. Short-term “diets” only bring short-term results.