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Table 2 Effects of maca root extract, Chinese chive extract and combined extracts on testosterone, NO and cGMP levels (mean ± SD)

From: Effects of combined extracts of Lepidium meyenii and Allium tuberosum Rottl. on erectile dysfunction

Groups Serum Penis
Testosterone (nmol/L) NO (μmol/L) cGMP (μmol/L) NO (μmol/L) cGMP (μmol/L)
Group 1 (control) 15.93 ± 2.11 82.26 ± 12.19 6.17 ± 1.09 116.20 ± 0.014 12.14 ± 1.97
Group 2 (maca root extract, 200 mg/kg/d, b.w) 15.86 ± 2.06 94.25 ± 8.92 6.81 ± 1.77 118.05 ± 0.026 12.86 ± 1.04
Group 3 (Chinese chive extract, 200 mg/kg/d, b.w) 15.72 ± 4.56 98.94 ± 14.48* 7.03 ± 1.58 136.90 ± 1.81 13.21 ± 1.81
Group 4 (combined extracts, 200 mg/kg/d, b.w) 15.83 ± 2.20 104.69 ± 8.83** 7.23 ± 1.44 143.18 ± 0.023* 15.01 ± 1.89*
Group 5 (Viagra, 14 mg/kg once before mating experiment) 15.57 ± 3.30 116.62 ± 15.19* 8.26 ± 1.69* 149.73 ± 0.022* 15.39 ± 2.19*
  1. *P < 0.05, **P < 0.01 vs control