The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
However, at increasing dosages of 0.2mg, one mg, five mg of oral finasteride per day, over the same period of time, the increase or I should say the reduction in dihydrotestosterone, doesn't increase linearly. It's not that you go from 50%-6 0%-75%- 100% with each increasing dose, it tapers off, it flattens out.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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What it means is that, for a dosage of 0.01mg of finasteride, you're going to achieve approximately 50% reduction in DHT, and that's systemic DHT, so this is a blood draw measuring your DHT, then taking 0.01mg of finasteride.
Now, the dosages of finasteride that have been shown to be effective for inducing hair growth, cover an enormous range. As low as 0.01mg per day and as high as five mg per day, which is a just staggering range.