Hair regrowth · Since the '90s

Hair regrowth: what works, graded by evidence.

Whether hair can regrow depends less on the product and more on what kind of hair loss you have and how early you act. Here is how to tell where you stand, and what the evidence supports at each step.

Scott Blaine Hoffman, founder of Regrowth.comBy Scott Blaine Hoffman, founder of Regrowth.com · Updated November 12, 2026

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Can your hair regrow? Find your situation.

The same treatment can work brilliantly for one person and do nothing for another. These four patterns cover most of what I've seen in thirty years.

Best odds

Thinning, but the hair is still there

Finer, shorter hairs at the temples, part or crown mean the follicles are shrinking but alive. This is where minoxidil and DHT blockers do their best work, and starting early protects the most hair.

Usually recovers

Sudden, all-over shedding

Heavy shedding two to three months after illness, surgery, childbirth, a crash diet or a new medication is usually telogen effluvium. It tends to recover once the trigger passes. See a doctor if it lasts beyond six months.

Surgery territory

Smooth, bald for years

Medication rarely brings back areas that have been fully bald for a long time. A transplant can, if you have enough donor hair, but you still need a plan for the native hair around it.

See a dermatologist

Patchy, scarring, itchy or painful

Round bald patches, redness, scaling, pain or eyebrow loss point to alopecia areata, scarring alopecias or scalp disease. These need a diagnosis before any regrowth product.

Why timing matters

Hair loss is common, and it starts earlier than most people think.

Pattern hair loss is progressive. The earlier it's treated, the more hair is still there to keep, which is why the first rung of the ladder matters more than the last.

96%

of mature white men show some temple recession, including many who never progress further

ISHRS

16%

of men aged 18–29 have moderate to extensive hair loss

Rhodes et al., Dermatol Surg 1998

30%

of white men have androgenetic alopecia by age 30

Sinclair, BMJ 1998

53%

of men aged 40–49 have moderate to extensive hair loss

Rhodes et al., Dermatol Surg 1998

The biology

Why hair is lost.

Androgenetic alopecia

The most common cause in men and women. Genetically sensitive follicles shrink (miniaturize) over years in response to DHT, producing the Norwood pattern in men and diffuse Ludwig thinning in women.

DHT

Dihydrotestosterone is made from testosterone by the 5-alpha reductase enzyme. It binds receptors in scalp follicles and shortens their growth phase. Blocking its production is the backbone of medical treatment.

Telogen effluvium

Sudden diffuse shedding 2–3 months after a stressor — illness, surgery, crash dieting, childbirth, low ferritin. Usually reversible once the trigger resolves.

The hair regrowth treatment ladder

From first line to surgical.

Most people climb a few rungs, combined. Evidence grade reflects human data for androgenetic alopecia.

  1. 01

    Ketoconazole shampoo

    Anti-fungal, mild anti-androgen effect on the scalp. Adjunct, not a standalone.

    GRADE C
  2. 02

    Topical minoxidil

    FDA-approved for men and women. Extends the growth phase; needs daily consistency.

    GRADE A
  3. 03

    Finasteride / dutasteride

    Lowers DHT. Finasteride is FDA-approved for men; dutasteride is a stronger off-label option. Discuss sexual and mood side effects.

    GRADE A
  4. 04

    Oral minoxidil (low dose)

    Increasingly prescribed by dermatologists; watch for body hair growth and fluid retention.

    GRADE B
  5. 05

    Tretinoin + minoxidil

    Tretinoin may boost minoxidil response in low responders.

    GRADE C
  6. 06

    Low-level laser (LLLT)

    FDA-cleared devices show modest density gains in trials.

    GRADE B
  7. 07

    PRP

    Platelet-rich plasma injections; protocols vary widely, results mixed.

    GRADE C
  8. 08

    Peptides (GHK-Cu)

    Copper peptide topicals; supportive data is limited.

    GRADE C
  9. 09

    Hair transplant

    FUE/FUT relocates DHT-resistant follicles. Medical therapy still needed to protect native hair.

    GRADE A

Expect about 2 to 6 months before a medication shows a change, and up to a year for its full effect; stopping usually means the hair gained is lost again (GoodRx). Prescription options are a decision to make with a doctor or dermatologist.

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Go deeper

Hair regrowth guides by goal.

FAQ

Hair regrowth questions.

Can hair regrow after it falls out?

Often, yes, as long as the follicle is still alive. In pattern hair loss, follicles shrink slowly and keep producing thinner hairs for years, and those are the hairs medical treatment can thicken again. Areas that have been smooth and shiny for many years usually don't respond to medication; a transplant is the main way to restore them. Shedding after illness, childbirth or rapid weight loss (telogen effluvium) usually regrows on its own once the trigger has passed.

How long does hair regrowth take?

Most hair loss medications take about 2 to 6 months before you see a change, and up to a year to show their full effect. Hair also grows slowly, so new growth needs months more before it adds visible density. Take photos in the same light every few months rather than judging in the mirror.

What is the most effective hair regrowth treatment?

For pattern hair loss, topical minoxidil and (for men) finasteride have the strongest evidence, and they are often combined because they work in different ways. A transplant is the most reliable option for areas that are already bald, but it doesn't protect the native hair around it.

Does hair regrowth treatment work for women?

Yes. Topical minoxidil is approved for women, and dermatologists use other prescription options case by case. Thinning in women has more possible causes, including iron, thyroid and hormonal changes, so a medical workup comes first.

Do I have to keep using treatment forever?

For pattern hair loss, mostly yes. The hair gained or kept on medication is usually lost again within months of stopping, because the underlying cause hasn't gone away.

Regrowth.com Archive

Since the '90s.

Before forums and social media, Regrowth.com was a newsgroup where patients, physicians, dermatologists and trichologists traded real-world results. It grew past 50,000 members and became one of the first places online to separate working treatments from snake oil.

That archive of lived experience still shapes how we grade evidence today. Read Scott's 30-year perspective →

Not medical advice — talk to a licensed clinician. Content is educational, reflects published literature, and is not a recommendation to start, stop or change any treatment.