Table 6. Melatonin expression

Group	Melatonin (ng/㎖)
I	1.55 ± 0.11
II	1.05 ± 0.08#
III	1.27 ± 0.08*

Data were represented as mean ± standard deviation
Signification difference as compared with untreated group (I) (P<0.05)
Signification difference as compared with control group (II) (P<0.05)
I : untreated group; II : treated with caffeine ; III : treated with caffeine and herb mixture