Bergamot and boxthorn applied topically increase the cutaneous activity of superoxide dismutase, collagen, and decrease malondialdehyde with an observable increase hair growth.
Shao LX. Effects of the extracts from bergamot and boxthorn on the delay of skin aging and hair growth in mice responsible for promoting hair regrowth. Zhongtguuo Zhong Yao Za Zhi 2003;28(8):766–9
Bergamot is an aromatic oil found in the peels of the fruit of the bergamot orange, a citrus tree which flourishes in Italy.