The Solar Window Hypothesis: Androgenetic Alopecia as an Evolutionary Adaptation to Maintain Bone Mineral Density in Vitamin D Receptor Low-Efficiency Variants
May 2026
in “
Medical Hypotheses
”
Research cited in this study
15 / 15 resultsresearch The Role of Vitamin D Receptor Signaling in Hair Follicle Health and Alopecia: Current Understanding and Therapeutic Implications
Vitamin D receptor is crucial for hair health and may help treat hair loss.
research Human Scalp Hair as a Thermoregulatory Adaptation
Tightly curled scalp hair helps reduce heat from the sun, protecting against overheating.
research Vitamin D Receptor Gene Polymorphisms Taq-1 and Cdx-1 in Female Pattern Hair Loss
Certain gene variations in the Vitamin D Receptor are linked to higher risk of female hair loss.
research Androgenetic Alopecia: A Review
Male pattern baldness involves genetics, hormones, and needs better treatments.
research Male Pattern Baldness and Risk of Incident Skin Cancer in a Cohort of Men
Men with male pattern baldness have a higher risk of certain skin cancers, especially on the scalp.
research Androgen Actions on the Human Hair Follicle: Perspectives
Androgens have complex effects on hair growth, promoting it in some areas but causing hair loss in others, and our understanding of this is still evolving.
research S1 Guideline for Diagnostic Evaluation in Androgenetic Alopecia in Men, Women, and Adolescents
Guidelines for diagnosing common hair loss include detailed history, clinical examination, and various diagnostic techniques.
research The Effect of 5α-Reductase Inhibition With Dutasteride and Finasteride on Bone Mineral Density, Serum Lipoproteins, Hemoglobin, Prostate Specific Antigen, and Sexual Function in Healthy Young Men
Dutasteride and finasteride do not significantly affect bone density, blood fats, or blood production, but slightly lower PSA levels and minimally impact sexual function in healthy young men.
research Premature Graying, Balding, And Low Bone Mineral Density In Older Women And Men
Balding men had lower bone density, while balding women had higher hip bone density.
research Hairless Triggers Reactivation of Hair Growth by Promoting Wnt Signaling
The HR protein helps hair grow by blocking a hair growth inhibitor, aiding in hair follicle regeneration.
research Genetic Variation in the Human Androgen Receptor Gene Is the Major Determinant of Common Early-Onset Androgenetic Alopecia
Genetic variation in the androgen receptor gene mainly causes early-onset hair loss, with maternal inheritance playing a key role.
research Marked Suppression of Dihydrotestosterone in Men with Benign Prostatic Hyperplasia by Dutasteride, a Dual 5α-Reductase Inhibitor
Dutasteride more effectively lowers DHT levels in men with enlarged prostates than finasteride.
research Genetic Variation at the MC1R Locus and the Time Since Loss of Human Body Hair
Humans lost body hair relatively recently in evolution.
research Human Osteoblast-Like Cells Express Predominantly Steroid 5α-Reductase Type 1
Human bone cells mainly produce a type 1 enzyme that may help regulate bone health.
research The Psychosocial Consequences of Androgenetic Alopecia: A Review of the Research Literature
Hair loss affects self-esteem and quality of life; treatments can help.
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research Androgenic alopecia may have evolved to protect men from prostate cancer by increasing skin exposure to ultraviolet radiation
Male pattern baldness might have evolved to help protect against prostate cancer by increasing UV radiation on the scalp.
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Vitamin D is important for more than just bone health.
research Prostate cancer and androgenic alopecia
The document suggests more research is needed to understand the link between baldness and prostate cancer.
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