Table 2.

Weight changes of mice exposed to zinc oxide nanoparticles and zinc salts. * denotes significant difference with the control group.

Control	7 Days	14 Days	28 Days
	30 ± 1.15	30 ± 2.24	29 ± 1.38
ZnO NPs	28 ± 2.71	27 ± 2.16	26 ± 2.52
ZnSO4	28 ± 3.12	26 ± 3.62	26 ± 2.93
Zn (NO3)2	29 ± 1.18	29 ± 1.73	27 ± 1.37
ZnCl2	30 ± 2.15	27 ± 1.62	25 ± 2.18*