Viability percentages of silymarin and silymarin-loaded SLN treated MCF-7 cells for 24 h. IC50 value for silymarin treated MCF-7 cells was not detected in this concentration range of the agent for 24 h. IC50 value for silymarin-loaded SLN treated MCF-7 cells was detected to be 18 µM for 24 h. *p<0.05, **p<0.01