These men stopped hair loss for 5 years… with a sugar pill

Rob English discusses a 5-year study on finasteride where 25% of the placebo group reported hair stabilization or regrowth, highlighting the challenges of interpreting hair loss research.

Explains androgenic alopecia's slow progression (5% per year) and hair cycle seasonality (5-15% fluctuations), which necessitate placebo groups to avoid false positive or negative results.

Analyzes whether the 'placebo effect' (mind over matter) could account for the results. Evidence from other studies suggests that while the nocebo effect regarding side effects is real, the placebo effect for hair growth is unlikely to be significant.

Proposes that the results are due to natural variability in hair loss speeds. Because hair density loss is visually imperceptible until 30-50% has shed, slow-progressing individuals in the placebo group likely had their mild loss masked by the study's photographic assessment methods.

Concludes that the placebo group results are an artifact of a well-designed study rather than a biological fluke. Emphasizes the importance of early evidence-based intervention for hair loss.