TLDR Amla extract helps hair grow and could prevent hair loss.
The study conducted 5 years ago aimed to determine the effects of amla (Phyllanthus emblica L.) extract on hair growth. The researchers found that amla extract had a significant effect on cell proliferative activity in human dermal papilla cells, particularly at a concentration of 50μg/ml. The extract also decreased the expression of 5α-reductase, an enzyme linked to hair loss, in a dose-dependent manner. Additionally, the extract increased the levels of IGF-1 & VEGF, factors known to accelerate the differentiation and growth of human dermal papilla cells, also in a dose-dependent manner. The results suggested that amla extract has a hair growth promoting effect and could potentially be used for the prevention of hair loss.
July 2020 in “Journal of Investigative Dermatology” Red clover extract-based scalp treatments significantly improved hair volume and reduced hair loss and damage.
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March 2019 in “Journal of Biomedical Science and Engineering” 
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December 2018 in “KSBB Journal” Amla extract helps hair grow and could prevent hair loss.
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July 2015 in “Asian Journal of Transfusion Science” Platelet-rich plasma (PRP) injections can effectively increase hair density and thickness in people with androgenic alopecia, without major side effects.
January 2014 in “프로그램북(구 초록집)” Platelet-rich plasma treatments help hair growth in people with hair loss by increasing certain cell growth and protein levels.
January 2011 in “Medical Journal of National Defending Forces in Northwest China”
January 2009 in “Chinese Journal of Aesthetic Medicine” 
September 1998 in “Journal of the European Academy of Dermatology and Venereology” Autoimmune and inflammatory processes are involved in both scarring and non-scarring types of hair loss.
