Hair Loss
Male pattern hair loss is the best-studied thing on this site — two FDA-approved drugs with decades of trial data, and an enormous industry built around them. What works, how well, what it costs you, and what the side-effect numbers actually say.
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Finasteride and Minoxidil: What the Trials Actually Show
The two hair loss drugs with real evidence behind them — how much hair they actually keep, and what the side-effect numbers say once you read the label rather than the forum.