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Diabetes Metab Syndr Obes. 2013 Aug 23;6:309-15. doi: 10.2147/DMSO.S49623. eCollection 2013.

Effects of a leucine and pyridoxine-containing nutraceutical on body weight and composition in obese subjects.

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  • 1NuSirt Sciences, Inc., The University of Tennessee, Knoxville, TN, USA ; Nutrition Department, The University of Tennessee, Knoxville, TN, USA.



We recently demonstrated leucine to modulate energy partitioning between adipose tissue and muscle. Further, leucine exhibits a synergy with B6, resulting in reduced adipocyte lipid storage coupled with increased muscle fat oxidation. Accordingly, a nutraceutical (NuShape™) containing 2.25 g leucine and 30 mg B6 increased fat oxidation by >30 g/day in a 28-day randomized controlled trial. The present study evaluated the long-term efficacy of this combination in modulating body weight and composition.


Two 24-week, placebo-controlled, randomized trials, one with weight maintenance (n = 20) and one hypocaloric (-500 kcal/day; n = 24), were conducted using the nutraceutical Nushape in obese subjects.


The supplement resulted in fat loss in the maintenance study (-1.12 ± 0.36 and -1.82 ± 0.70 kg at 12 and 24 weeks, P < 0.01 versus placebo) while no change was found in the placebo group. In the hypocaloric study, the supplement group lost up to twice as much weight (6.18 ± 1.02 versus 3.40 ± 0.81 kg at 12 weeks and 8.15 ± 1.33 versus 5.25 ± 1.13 kg at 24 weeks, P < 0.01) and fat (4.96 ± 0.61 versus 2.31 ± 0.53 kg at 12 weeks and 7.00 ± 0.95 versus 4.22 ± 0.74 kg at 24 weeks, P < 0.01) than the placebo group.


This nutraceutical combination results in significant fat loss in the absence of caloric restriction and markedly enhances weight and fat loss by 50%-80% over a 24-week period.


adiposity; body composition; caloric restriction; fat loss; leucine; pyridoxine; vitamin B6; weight loss

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