A randomized, placebo-controlled trial of 5% and 2% topical minoxidil solutions in the treatment of female pattern hair loss.
Journal of the American Academy of Dermatology - Avril 2004

(Abstract)

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CONCLUSION: In this 48-week study of 381 women with female pattern hair loss, 5% topical minoxidil was superior to placebo on each of the 3 primary efficacy end points: promoting hair growth as measured by change in nonvellus hair count and patient/investigator assessments of hair growth and scalp coverage. Application of 2% topical minoxidil was superior to placebo for assessments of nonvellus hair counts and investigator assessment of hair growth/scalp coverage at week 48; differences in patient assessment of hair growth at week 48 were not significantly different from placebo. At week 48, the 5% topical minoxidil group demonstrated statistical superiority over the 2% topical minoxidil group in the patient assessment of treatment benefit.

Female pattern hair loss may be triggered by low oestrogen to androgen ratio
http://www.ncbi.nlm.nih.gov/pubmed/18333699?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

en entier:
http://www.aepress.sk/_downloads/dl.php?from=pubmed&journal=ER&file=2008_01_13.pdf