First thing I'd say is if Dr Oz recommends it, be wary of it.
Honestly, a lot of the benefits aren't supported by current studes and the dangers are unknown.
WebMd says the following:
Quote:
GARCINIA Side Effects & Safety
Garcinia is POSSIBLY SAFE for most people when used for 12 weeks or less. Long-term safety is unknown. Garcinia can cause nausea, digestive tract discomfort, and headache.
A study using Garcinia Cambrogia (GCE here)
http://www.ncbi.nlm.nih.gov/pubmed/21936892
Quote:
RESULTS:
EGML and GCE supplementation failed to promote weight-loss or any clinically significant change in %body fat.
Here is a study of studies where basically they went through all known studies to determine the effectiveness of common dietary supplements.
http://www.ncbi.nlm.nih.gov/pubmed/20847896
Quote:
Abstract
Objective. To review the literature on fat modifying dietary supplements commonly used for weight loss. Methods. Recently published randomized, placebo-controlled trials were identified in PubMed, MEDLINE, International Pharmaceutical Abstracts, Cochrane Database, and Google Scholar using the search terms dietary supplement, herbal, weight loss, obesity, and individual supplement names. Discussion. Data for conjugated linoleic acid (CLA), Garcinia cambogia, chitosan, pyruvate, Irvingia gabonensis, and chia seed for weight loss were identified. CLA, chitosan, pyruvate, and Irvingia gabonensis appeared to be effective in weight loss via fat modifying mechanisms. However, the data on the use of these products is limited. Conclusion. Many obese people use dietary supplements for weight loss. To date, there is little clinical evidence to support their use. More data is necessary to determine the efficacy and safety of these supplements. Healthcare providers should assist patients in weighing the risks and benefits of dietary supplement use for weight loss.