12 citations,
January 2021 in “Journal of Investigative Dermatology” Hair follicle studies suggest that maintaining telomere length could help treat hair loss and graying, but it's uncertain if mouse results apply to humans.
12 citations,
January 2021 in “Springer eBooks” 
11 citations,
November 2021 in “Clinical, Cosmetic and Investigational Dermatology” Resveratrol may help hair grow, but more research is needed.
11 citations,
May 2012 in “Genesis” Bmpr2 and Acvr2a receptors are crucial for hair retention and color.
10 citations,
August 2021 in “Frontiers in cell and developmental biology” Scientists made structures that look like human hair follicles using stem cells, which could help grow hair without using actual human tissue.
9 citations,
April 2019 in “Biomolecules & Therapeutics” Udenafil may help hair grow by activating certain stem cells.
9 citations,
April 2019 in “Bioscience, biotechnology, and biochemistry” Ten miRNAs may play key roles in starting secondary hair follicle development in sheep foetuses.
8 citations,
July 2020 in “Clinical, cosmetic and investigational dermatology” Excessive sun protection might cause frontal fibrosing alopecia by disrupting skin immune balance.
8 citations,
August 2014 in “Biochemical and Biophysical Research Communications” ODC overexpression in hair cells increases tumor growth by reducing Notch signaling.
7 citations,
December 2021 in “Pharmaceutics” Natural products like plant extracts can help promote hair growth and could be used to treat hair loss.