November 2025 in “Journal of Investigative Dermatology” Estetrol may help prevent hair loss and support hair growth in women.
September 2024 in “Journal of the American Academy of Dermatology” Estetrol (E4) may help treat female pattern hair loss by prolonging hair growth.
October 2023 in “Journal of the Endocrine Society” Estetrol helps keep scalp hair in the growth phase longer and improves hair follicle health by affecting the hair root and increasing stem cells.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” Estetrol may help prevent hair loss and promote hair growth in women.
January 2024 in “Estetologia Medyczna i Kosmetologia” Most hair loss shampoos have unproven active ingredients.