6-Gingerol Inhibits Hair Shaft Growth in...r Grown in Mice
In summary, we report for the first time that 6-gingerol has no effect on promoting hair growth, on the contrary, can suppress human hair growth via its inhibitory and pro-apoptotic effects on DPCs in vitro, and cause prolongation of telogen phase in vivo. Thus, 6-gingerol rather than being a hair growth stimulating drug, it is a potential hair growth suppressive drug, i.e. for hair removal. The inadequacies of this study are that this research has slightly fewer cases, the unknown effect of 6-gingerol on follicular epithelial cells and genetic changes of 6-gingerol on dermal papilla cells in vivo. Therefore, in future experiments, besides increasing the sample size, we should do further experiments to address the above-mentioned problems.
The paper was published in Feb, 2013 and so it's pretty recent. Not sure I buy this study, but it at least seems interesting.