research Relationship Between Androgenic Alopecia and White Matter Hyperintensities in Apparently Healthy Subjects June 2019 in “Brain Imaging and Behavior” Hair loss can indicate brain aging and potential small vessel disease, but more research is needed to understand the clinical impact.
research Increased Hair Polyamine Levels in Patients with Alzheimer's Disease 10 citations , June 2001 in “Annals of neurology” Alzheimer's patients have higher levels of certain chemicals in their hair.