Green Coffee Ultra contains the highest quality form of chlorogenic acids (the stuff that makes green coffee work) called GCA. GCA is the exact Green Coffee extract that was used in the clinical study published in the Diabetes, Metabolic Syndrome and Obesity journal. They were supplemented with GCA green coffee bean and lost an average of 17 pounds in 12 weeks of use. For the results of the study using GCA Green Coffee go to http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3267522/ GCA is the most reputable form of chlorogenic acids available. The only potential downside of this product is low absorption levels in the intestine requiring more pills. Studies show that if you do not address absorption you will often only absorb a very small portion of your supplement (10-20%). Without new absorption technology (thermo-nutrients) be careful as the rest of your investment may go down the toilet.