Figure 16: The effect of the QELBY colloid on the viability of MCF-7 breast cancer cells. The QELBY colloid was prepared by mixing with 1% of QELBY power and DMEM and centrifuged at 3,000 rpm. A different amount of the supernatant was used for the preparation of DMEM media. Data are mean ± SD . Means with different superscript are significantly different at .