expression in hair follicle cells, thereby signaling
the induction of anagen, active growth phase of
the hair cycle [37]. To elucidate the precise biological
mechanism underlying the effects of the A.
radix extract on hair growth, additional research
on the anti-apoptotic effect of this extract is
needed. But, unfortunately, the A. radix extract
did not show an inhibitory effect on the expression
of 5a-reductase in the present study. However,
based on its abilities to stimulate cellular proliferation
and VEGF expression, the A. radix extract
appears to be a good candidate for the promotion
of hair growth.