... RongLiangPing, add methanol, ultrasonic oscillations 30 min, cold to room temperature to scale after dilution, filter, precision to absorb the filtrate ... plug, shake well, water bath 2 hours, cold to room temperature, using 1 cm than color dish, in 515 + 2 nm ... -45% thistles saponins extract Tribulus Terrestris (40-90%) direct supplying from our factory !!!