synthase by inhibit nitric oxide production, or 5α-
reductase (Rifkia et al., 2017).
Topical gel containing white ginger extract and
red ginger extract with various concentration of
extract showed the dose dependent hair growth
activity. Higher concentration of extract in gel
formulation has better hair growth activity, it
showed by longer in hair length, faster in hair
growth time and heavier in hair weight from 1
st
week, 2
nd
week and 3
rd
week. Herbal extract showed
the dose dependent hair growth activity (Kanedi et
al., 2017). Herbal was very effective for hair growth
promotion without skin irritation. Hair growth
activity of extract might be caused by the
antioxidant effect and lead to improvement in blood
flow to scalp (Semalty et al., 2010). Herbal might
promote hair growth, enhance hair health, and
effective for treating hair loss (Yu et al., 2017).
Herbal extract treatment could proliferated human
dermal papilla cells, significantly stimulated the
expression of Ki-67 protein and the messenger
ribonucleic acid levels of hepatocyte growth factor
(Boisvert et al., 2017). Herbal might be an
alternative for synthetic drugs used for alopecia
without any side effect.
4 CONCLUSIONS
White ginger extract has weakerhair growth activity
than minoxidil, but red ginger extract has stronger
hair growth activity than minoxidil. Evaluation of
hair growth activity with hair growth time, hair
length, and hair mass parameter showed significant
difference between white ginger extract and red
ginger extract. Red ginger extract showed better hair
growth activity than white ginger extract.
ACKNOWLEDGEMENT
The authors acknowledge the financial support by
Research Institutions, University of Sumatera Utara,
inaccordance with the Contract Research TALENTA
University of Sumatera Utara, Fiscal Year 2018 with
Contract number 290 / UN5.2.3.1 / PPM / KP-
TALENTA USU / 2018 on 16 March 2018.
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