Lay opinion vs evidence: Haarausfall Basis

Lay opinion often attributes hair loss to stress, poor diet, or vitamin deficiency, leading people to self-supplement or use special shampoos. Evidence: The most common form, androgenetic alopecia, is genetically and hormonally driven. Iron deficiency or thyroid issues can contribute but require clinical confirmation. Consumer vitamin D or zinc tests may indicate trends but lack diagnostic accuracy. Supplementation without lab-verified deficiency is not evidence-based and can be harmful (e.g., vitamin A or selenium toxicity). A doctor should evaluate hair loss with a proper history, exam, and lab tests before recommending treatment.