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In vitro cytotoxicity of free sulforaphane (SFN) and sulforaphane-loaded Formulation E (SFN-Etho) on SK-MEL 28 melanoma cells as a function of the drug concentration and incubation time. The results were normalized as a function of the blank formulation E cytotoxicity. Results are the mean of three different experiments ± standard deviation. The data obtained for SFN-Etho are statistically significant with respect to the same concentration of free SFN (* p < 0.05; ** p < 0.001).
