The effect of Nigella sativa on serum levels of insulin-like growth factor and its binding proteins in postmenopausal women with low bone density: A triple-blind randomized controlled trial

Animal studies have shown that Nigella sativa (NS) seed oil can increase Insulin-like growth factor (IGF-1) serum levels. This study aimed to investigate the effect of oral capsule NS on serum levels of IGF-1 and its binding proteins (IGFBP-1, IGFBP-3) in postmenopausal women with bone loss density. Sixty postmenopausal women of 50 to 65 years with bone loss density randomly received a soft capsule of NS oil 1000 mg or placebo once daily for six months with a 1:1 allocation ratio. DEXA method was used to measure bone density. Serum concentrations of IGF-1, IGFBP-1 and-3, ALT, AST, ALP, Cr, and urea were measured at baseline and after the intervention. There were no significant differences in serum levels of IGF1, IGFBP-1, urea, Cr, ALT, AST, and ALP between the two groups at the end of six months. However, a significant increase has been shown in IGFBP-3 between groups after the intervention (Adjusted mean difference: 95% CI: 1.65: 0.36 to 2.97; p=0.013). We observed a significant increase in IGFBP-3 serum levels without any side effects. Additional research with an increased number of participants may be needed for further clarification of its beneficial anabolic effects on the GH system.