Related Experiment Video
Updated: Jul 23, 2026

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
Published on: March 9, 2015
Fractional CO 2 Versus Radiofrequency as Hair Regrowth Enhancers for Female Androgenic Alopecia: A Randomized
Rana F Hilal1, Eman Shaarawy, Nehal Ahmed
1All authors are affiliated with the Department of Dermatology, Kasr Al Ainy Teaching Hospital, Cairo University, Cairo, Egypt.
Background:
Androgenic alopecia (AGA) is a cosmetically disfiguring condition, which accounts for most cases of diffuse hair loss among females, negatively impacting their quality of life. Combining Fractional CO 2 (FCO 2 ) or Fractional Microneedling Radiofrequency (FMRF) with topical minoxidil 5% could achieve a better clinical outcome.
Objective:
To compare efficacy and safety of FCO 2 and FMRF, combined with minoxidil, for the treatment of female AGA.
Methods:
Thirty patients with female AGA were randomly assigned to 2 groups (simple computerized randomization). Group A patients received FCO 2 to 1 randomly selected side of the scalp, and Group B patients received FMRF to 1 randomly selected side of the scalp (picking masked labeled cards). Patients received minoxidil 5%.
Results:
Significant increase in trichoscopic hair counts and density was found after treatment with each modality whether minoxidil 5% alone, minoxidil combined with FCO 2 , or minoxidil combined with FMRF. A significantly greater increase in trichoscopic hair counts and density followed the treatment with minoxidil + FMRF, compared to either minoxidil + FCO 2 or minoxidil alone.
Conclusion:
It can be proposed that combining FMRF with minoxidil for the treatment of female AGA could be associated with higher efficacy and tolerability, compared to the other treatment modalities.

