Green tea weight loss depends on bioavailability of the active ingredient EGCG from green tea extracts. Phytosome technology doubles the bioavailability, which significantly boosts weight loss. Here is a summary of the study..
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Green Tea Weight Loss Study

Development of phytosome technology for green tea extraction has shown to double bioavailability of EGCG and enhance its antioxidant power. The technology is now available to supplement manufacturers under the name, GreenSelect Phytosome. See my post on this research here: Green Tea Weight Loss – The Real Science.

The first clinical study of weight loss with GreenSelect Phytosome compared a low-calorie diet (control) against a low-calorie diet supplemented with the new green tea product (treatment). Here are the citation data and the published abstract of this study:

Di Pierro F, Menghi AB, Barreca A, Lucarelli M, Calandrelli A. 2009. Greenselect Phytosome as an adjunct to a low-calorie diet for treatment of obesity: a clinical trial. Altern Med Rev. 2009 Jun;14(2):154-60.

A recently developed oral formulation in the form of coated tablets (Monoselect Camellia) (MonCam) containing highly bioavailable green tea extract (GreenSelect Phytosome) was tested in obese subjects (n=100) of both genders on a hypocaloric diet. Fifty subjects were assigned to the green tea extract plus hypocaloric diet, while the other 50 subjects followed the hypocaloric diet only. After 90 days of treatment, significant weight loss and decreased body mass index (BMI) were observed in the group taking the herbal extract (14-kg loss in the green tea group compared to a 5-kg loss in the diet-only group); waistline was reduced only in male subjects. Besides the effect on weight and BMI, biochemical parameters (LDL-, HDL-, and total cholesterol, triglycerides, growth hormone, insulin-like growth factor-1, insulin, and cortisol) were improved in both groups. Leptin, not tested in the diet-only group, was reduced in patients taking MonCam. Taking into consideration the high safety profile of the product and the total absence of adverse effects observed during and after the trial, MonCam appears to be a safe and effective tool for weight loss.

The main results included improvement in several biochemical markers. However, the key outcome was weight loss, as shown in Table 1 from the study:

The hypocaloric diet referred to in the abstract and in the table entailed 1,850 Calories per day for men and 1,350 Calories per day for women. Results are expressed in kilograms (kg). A difference of 8.192 kg at 90 days computes to 18 lbs. The difference between control and treatment groups was statistically significant at 90 days, but not statistically significant at 45 days.

Finding Products Containing GreenSelect Phytosome

Since the technology is patented, supplement manufacturers must have a license to include it in green tea products. The first companies to do so were Thorne Research, which produces supplements for health care professionals, and Natural Factors, which is more widely available on the internet. You can search for it under GreenSelect Phytosome or under the brand name MonCam.

This is the best oral preparation of green tea extract on the market.

Updating green tea weight loss research,

Dr. D