Finasteride works by lowering DHT, the hormone that gradually shrinks (miniaturises) genetically sensitive follicles in androgenetic alopecia. Where you still have miniaturised hair, the follicle is alive but underperforming, and reducing DHT gives it a real chance to stabilise or partly recover, which is why the medication is most effective when started early. If you are in the early-to-moderate stages, where you can still see fine or wispy hairs across the thinning area, there is genuinely something to preserve, and starting now is usually far better than waiting and watching it progress. Results are not instant, however; it typically takes several months of daily use before any change is visible, and the main goal is often to halt further loss rather than to fully reverse it.
The point where it becomes truly too late is when an area of scalp has gone fully bald, smooth, and shiny, with no fine hairs and no visible pores producing hair. At that stage the follicles have been lost rather than shrunk, and no drug, including finasteride or minoxidil, can bring back a follicle that no longer exists; restoring hair there generally requires a transplant. To gauge which situation you are in, look closely in good light: scattered fine, downy hairs suggest living follicles worth treating, while a slick, hairless surface suggests they are gone. The bottom line: if you still have any hair in the thinning zone, do not assume it is too late, and see a dermatologist who can assess your follicles up close, confirm the diagnosis, and start a proven plan before more ground is lost.
Try the free self-check →Sources: AGA review (CCID) ↗
FAQ
How do I tell if my follicles are still alive?
In a bright light or under magnification, look for fine, short, or colourless hairs across the thinning area; their presence means the follicles are miniaturised but still living and potentially treatable. A patch that is completely smooth, shiny, and hairless with no visible pores usually means the follicles are gone. A dermatologist can confirm this with a close scalp exam or dermoscopy, which is far more reliable than a self-check.
Will finasteride regrow hair on a bald, shiny area?
No. Finasteride and other DHT-lowering or stimulating treatments can only help follicles that are still present and producing hair, so they cannot revive a fully bald, smooth scalp where the follicles are gone. For those areas, a hair transplant is the realistic option, while medication is still valuable to protect the hair you have elsewhere. A dermatologist or hair-restoration specialist can tell you which zones are still treatable with medication.
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⚠️ When to see a doctor — don’t self-treat
- Sudden patchy or circular bald spots
- Redness, scaling, pus, pain or itch (possible scarring alopecia — treat urgently)
- Broken hairs or rapid loss
- Loss with body-wide signs (weight loss, fatigue, cycle changes, acne, extra hair)
- Loss right after a new medication
- Any hair loss in a child