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December 2001 in “Linchuang pifuke zazhi” In this study, certain Chinese herbal medicines were found to significantly stimulate or inhibit hair growth in an in vitro organ culture model of mouse vibrissa follicles.
This study observed that spironolactone, in various doses, did not affect the growth or DNA synthesis of human hair follicles in vitro compared to a control group.
January 2005 in “Pharmaceutical Journal of Chinese People's Liberation Army” In this study with cultured C_57BL/6J mouse hair follicles, ginseng extract at a concentration of 0.1 mg/ml was reported to best promote hair growth.
January 2002 in “Journal of Clinical Dermatology” This study found that lower concentrations of minoxidil promoted human hair follicle growth in vitro, while a higher concentration inhibited growth.
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January 2004 in “PubMed” In this study, NGF and minoxidil increased the growth of human hair follicles while 17 beta-E2 inhibited it; NGF also neutralized 17 beta-E2's inhibitory effect.