Tribulus (Tribulus terrestris) References
    
        
        
            
        
            Bedir E, Khan IA, Walker LA. Biologically active steroidal glycosides from Tribulus terrestris. Pharmazie 2002;57(7):491-493. 
  Brown GA, Vukovich MD, Martini ER, et al. Effects of androstenedione-herbal supplementation on serum sex hormone concentrations... 
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