Effect on human epidermal cells: Yttrium is a rare element and has no effect on the proliferation of epidermal cells in vitro at low concentrations. Yttrium chloride has a certain effect on ultraviolet-induced epidermal cell apoptosis. Research results show that human epidermal cells cultured with a low concentration of yttrium chloride 0.1mmol/L have a certain protective effect on ultraviolet-induced apoptosis; while high concentrations of 2.0 and 3.0 Compared with mChemicalbookmol/L yttrium chloride and the control group, although there is no statistically significant difference, the epidermal cell apoptosis rate is higher than that of the control group, indicating that yttrium chloride may have a two-way effect on epidermal cell apoptosis, and it may be possible at low concentrations. It protects epidermal cell apoptosis induced by ultraviolet rays, but may promote epidermal cell apoptosis at high concentrations. Its mechanism of action needs further study.