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The story of how finasteride was discovered reads like medical detective work: a remote village in the Dominican Republic, men who never went bald, and a pharmaceutical company's race to create a blockbuster drug.

It's a compelling origin story. And it worked: finasteride became one of the most prescribed hair loss treatments in the world, used by millions, including celebrities like Elon Musk and Ashton Kutcher.

But the discovery that seemed like a medical miracle came with a dark side that scientists didn't predict:

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You've been diagnosed with Hashimoto's disease. Your doctor prescribed levothyroxine. Your TSH is coming down. Your energy is improving.

But your hair is still falling out.

Clumps in the shower. Thinning at the temples. A widening part line. Hair that used to be thick and healthy now looks dull, brittle, and sparse.

You're doing everything right medically, but your hair isn't recovering. Why?..

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