The effect of 7-Keto Naturalean™ on weight loss: A randomized, double-blind, placebo-controlled trial

John L. Zenk, Tami R. Helmer, Laurie J. Kassen, Michael A. Kuskowski

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Background: A natural metabolite of dehydroepiandrosterone (DHEA), 3-acetyl-7-oxo-dehydroepiandrosterone (7-oxo-DHEA), has been shown to be effective in enhancing weight loss when combined with a diet and exercise program. Objective: This study assessed the effects of a formula containing 7-oxo-DHEA, L-tyrosine, asparagus root extract, choline bitartrate, inositol, copper gluconate, manganese, and potassium iodide (7-Keto Naturalean™) on weight loss, body composition, and basal metabolic rate (BMR) in overweight patients following a weight-reduction diet and exercise regimen. Methods: In this prospective, randomized, double-blind, placebo-controlled trial, healthy, overweight adults were given 7-Keto Naturalean (200 mg/d) or a placebo of maltodextrin and followed a calorie-restricted diet (105 kJ/kg) and an exercise program for 8 weeks. Body weight, body composition (by bioelectric impedance), and BMR (by indirect calorimetry) were measured at baseline, week 4, and week 8. A thyroid panel was done at baseline and week 8. Results: Of 35 healthy, overweight adults enrolled, 33 completed the study (12 men, 21 women; age, 40-69 years; body mass index [BMI], 27.0-42.7 kg/m2). Patients taking 7-Keto Naturalean lost significantly more weight after 8 weeks than those taking placebo (mean ± SD loss, 2.15 ± 2.38 kg and 0.72 ± 2.12 kg, respectively) (P = 0.038). The change in BMI in the 7-Keto Naturalean-treated group was significant compared with the change in the placebo group (mean ± SD decrease, 0.71 ± 0.79 kg/m2 and 0.01 ± 1.05 kg/m2, respectively) (P = 0.036). There were no other statistically significant differences in any of the other measured variables. 7-Keto Naturalean was well tolerated, and there were no significant adverse events. Conclusion: In this select population, 7-Keto Naturalean combined with a reduced-calorie diet and an exercise program resulted in a significant weight loss compared with diet and exercise alone.

Original languageEnglish (US)
Pages (from-to)263-272
Number of pages10
JournalCurrent Therapeutic Research - Clinical and Experimental
Issue number4
StatePublished - Jan 1 2002


  • 7-oxo-DHEA
  • Dehydroepiandrosterone
  • Obesity
  • Weight loss

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