Does Testosterone Affect Hair Loss?

Short answer: not directly in the way most people think. Male pattern baldness is driven by inherited sensitivity of scalp hair follicles to DHT, a testosterone derivative — not by high overall testosterone. Most balding men have normal testosterone.

The DHT pathway

Testosterone is converted to dihydrotestosterone (DHT) by the enzyme 5-alpha-reductase. In men genetically predisposed to androgenetic alopecia, scalp hair follicles are sensitive to DHT and miniaturise over time, producing the classic pattern of receding and thinning hair.

The driver is the local DHT sensitivity, not the systemic testosterone level. Men with low testosterone can still bald; men with high testosterone may keep their hair.

What about body hair?

Different story. Body and beard hair growth depend on overall testosterone exposure. Low testosterone can reduce body and beard hair density. This is the hair signal most associated with hormonal change.

Will TRT cause hair loss?

In men with normal hair, generally not. In men with active male pattern baldness, there's a theoretical concern that more testosterone produces more DHT and accelerates loss. Clinical evidence is mixed; for men with concerns, discussing with a doctor is reasonable.

For hair loss specifically

Treatment for male pattern baldness (5-alpha-reductase inhibitors, topical minoxidil) is independent of testosterone management. See Noah's hair loss treatment information.

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