DHT and Hair Loss: The Hormone Behind Male Balding

DHT (dihydrotestosterone) is a hormone your body makes from testosterone via an enzyme called 5-alpha-reductase. It is a normal, useful androgen with real jobs in the body - but in the scalp, for men who are genetically susceptible, it is also the main driver of pattern hair loss.

The key idea is that DHT is more potent than testosterone at the receptors it acts on, and certain follicles are exquisitely sensitive to it. That sensitivity, not the raw amount of hormone floating around, is what decides whether you lose hair.

Through a slow process called miniaturization. In susceptible follicles, DHT progressively shortens the growth phase and shrinks the follicle, so each cycle produces a finer, shorter, weaker hair than the last - until the follicle effectively gives up.

This is why pattern loss is gradual and why the hair thins before it disappears: you are watching miniaturization play out over years. It also explains the pattern itself - the follicles at the hairline and crown are the DHT-sensitive ones, while the band at the back and sides is largely resistant, which is the whole basis of transplant surgery.

No - and this is the myth worth killing. Men with pattern hair loss do not generally have abnormally high testosterone or DHT; they have follicles that are genetically sensitive to normal DHT levels.

That distinction matters because it means the goal is not to tank your hormones but to reduce DHT's effect at the scalp. It is also why lowering DHT for hair does not have to mean gutting your testosterone - a fear addressed head-on in does finasteride lower testosterone.

To act on any of this, a clinician evaluation is the start; our provider comparison maps the options. This article is general information, not medical advice.