Clinical efficacy of the co-administration of Turmeric and Black seeds (Kalongi) in metabolic syndrome - a double blind randomized controlled trial - TAK-MetS trial

Complement Ther Med. 2015 Apr;23(2):165-74. doi: 10.1016/j.ctim.2015.01.008. Epub 2015 Jan 14.


Objective: To compare the clinical efficacy of Black seeds and Turmeric alone and its co-administration in lower doses among patients with metabolic syndrome (MetS).

Design: Double-blind-randomized-controlled trial.

Setting: Hijrat colony, Karachi, Pakistan.

Intervention: Apparently healthy males (n=250), who screened positive for MetS, were randomized to either Black seeds (1.5g/day), Turmeric (2.4g/day), its combination (900mg Black seeds and 1.5g Turmeric/day) or placebo for 8 weeks.

Main outcome measures: body-mass-index (BMI), body-fat-percent (BF%), waist-circumference (WC), hip-circumference (HC), blood pressure (BP), lipid-profile (cholesterol, HDL-cholesterol, LDL-cholesterol and TG), fasting blood glucose (FBG) and c-reactive protein (CRP).

Results: At 4 weeks, compared to baseline, Black seed and Turmeric alone showed improvement in BMI, WC and BF%. Combination improved all parameters except HDL-cholesterol with lower FBG and LDL-cholesterol as compared to placebo. At 8 weeks, compared to placebo, Black seeds reduced lipids and FBG, while Turmeric reduced LDL-cholesterol and CRP. Interestingly, combination group with 60% dose of the individual herbs showed an improvement in all parameters from baseline. When compared to placebo, it reduced BF%, FBG, cholesterol, TG, LDL-cholesterol, CRP and raised HDL-cholesterol.

Conclusion: Turmeric and Black seeds showed improvement in all parameters of metabolic syndrome, when co-administered at 60% of doses of individual herbs with enhanced efficacy and negligible adverse-effects. The combination of Black seeds and Turmeric can therefore, be recommended with lifestyle modification as a starting point for patients with MetS to halt its future complications and progression.

Keywords: Black seeds; Clinical efficacy; Co-administration; Metabolic syndrome; Synergism; Turmeric.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Curcuma / chemistry*
  • Humans
  • Male
  • Metabolic Syndrome / drug therapy*
  • Middle Aged
  • Nigella sativa / chemistry*
  • Pakistan
  • Phytotherapy*
  • Plant Preparations / adverse effects
  • Plant Preparations / therapeutic use*


  • Plant Preparations