TLDR Putting α-methylspermidine on mouse skin can start hair growth.
In the 2009 study, researchers found that the cutaneous application of α-methylspermidine (α-MeSpd) on mice induced the transition from the resting phase (telogen) to the growth phase (anagen) of hair follicles after 2 weeks. The study, which involved 5 mice in the control group and 6 mice in each of the two treatment groups, showed that α-MeSpd penetrated the skin and partially replaced natural polyamines, leading to an increased total pool of polyamines including the analog. This resulted in pigmentation, growing hair follicles, increased proliferation of follicular keratinocytes, and upregulation of β-catenin. These findings suggest that polyamines are significant in hair cycle regulation and that hair growth can be stimulated using stable polyamine analogs.
375 citations,
February 2006 in “Journal of Cell Science” The document concludes that the hair cycle is a complex process involving growth, regression, and rest phases, regulated by various molecular signals.
37 citations,
February 2005 in “Journal of Investigative Dermatology” 3 citations,
January 2005 in “Biological & Pharmaceutical Bulletin” The peptide GPIGS helps hair cells grow and speeds up hair regrowth in mice.
450 citations,
January 2005 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair color is determined by melanin produced and transferred in hair follicles.
854 citations,
February 2002 in “The journal of investigative dermatology/Journal of investigative dermatology” Understanding hair follicle development can help treat hair loss, skin regeneration, and certain skin cancers.
54 citations,
May 2001 in “Journal of Investigative Dermatology” 124 citations,
July 1997 in “Journal of Biological Chemistry” 71 citations,
May 1996 in “Journal of Investigative Dermatology”
January 2021 in “Journal of Allergy and Therapy” Electric Follicle Stimulation may promote hair growth and density with no known side effects.
12 citations,
December 2009 in “Amino Acids” Putting α-methylspermidine on mouse skin can start hair growth.
January 2007 in “Strait Pharmaceutical Journal” 154 citations,
October 1996 in “Proceedings of the National Academy of Sciences of the United States of America” Estrogen affects hair growth and skin cell multiplication.
65 citations,
October 1988 in “Clinics in dermatology” The dermal papilla interacts with the epidermis to control hair growth and development.