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CLINICALLY TESTED RESULTS. 682% Mean Increase in Serum Peptide Levels. In a recent, randomized, cross-over, double-blind clinical trial, healthy subjects between 18 and 70 years of age were recruited. Subjects were scheduled for two testing sessions a week apart where, after an overnight fast, blood samples were drawn over a period of 120 minutes after consumption of either the GF-9 proprietary blend or placebo capsules. Neither the subjects nor the investigators knew at which session the subjects received the GF-9 blend and at which session they received the placebo. At the end of the study, the samples were tested for serum levels of a specific single-chain peptide, and the results were independently analyzed. The results: the GF-9 blend let to a 682% mean increase in serum (blood) levels of this specific single-chain peptide at 120 minutes, which was significant above and beyond placebo.