Hair loss can’t be permanently “cured” in most cases, but it can be significantly slowed, stopped, or reversed depending on what’s causing it. The right approach depends entirely on the type of hair loss you have. Pattern hair loss (the most common kind, affecting roughly half of men by age 50 and a significant number of women) is driven by hormones and genetics. Other types are triggered by nutritional deficiencies, autoimmune attacks, or stress. Each has a different treatment path, and some respond far better than others.
Why Hair Falls Out in the First Place
In pattern hair loss, a hormone called DHT binds to receptors in genetically susceptible hair follicles and gradually shrinks them. Each growth cycle produces a thinner, shorter hair until the follicle eventually stops producing visible hair altogether. This process, called miniaturization, is why thinning tends to happen slowly over years rather than all at once.
Your hair naturally cycles through three phases: a growth phase lasting 2 to 7 years (about 90% of your hair is here at any given time), a brief regression phase of about 2 weeks, and a resting phase of roughly 3 months before the hair sheds and a new one begins growing. DHT shortens the growth phase and lengthens the resting phase, so over time you have fewer hairs actively growing and more follicles sitting idle.
This matters for treatment timing. The earlier you intervene, the more follicles are still capable of producing healthy hair. Once a follicle has fully miniaturized and gone dormant for years, it becomes much harder to revive.
Medications That Slow or Reverse Thinning
Two medications have the strongest evidence base for pattern hair loss. Finasteride, a daily pill for men, works by blocking the enzyme that converts testosterone into DHT. A 10-year Japanese study of 523 men found that 91.5% showed measurable hair improvement, and 99.1% at least stopped losing more hair. Results typically become visible within the first year and continue improving over time.
The main concern with finasteride is sexual side effects. Clinical data puts the incidence of erectile dysfunction, reduced sex drive, and ejaculation changes at roughly 6 to 10% in blinded studies. However, those numbers nearly triple when patients are told in advance about the potential for sexual side effects, suggesting a strong psychological (nocebo) component. For most men, side effects resolve after stopping the medication, though a small number report persistent issues.
Minoxidil is the other mainstay, available over the counter as a liquid, foam, or now an oral low-dose version prescribed off-label. It works by increasing blood flow to hair follicles and extending the growth phase. It’s effective for both men and women. Results typically show at 4 to 6 months, and you need to keep using it to maintain the benefit.
Options for Women
Women with pattern hair loss face different constraints since finasteride isn’t approved for them due to risks during pregnancy. Spironolactone, a medication that blocks androgen activity, is widely prescribed instead. A study of women on low-dose spironolactone (averaging about 35 mg daily) found their hair loss severity scores dropped significantly after approximately one year, from an average of 2.47 to 1.81 on a standardized 5-point scale. Minoxidil remains a first-line option for women as well.
Platelet-Rich Plasma (PRP) Injections
PRP therapy involves drawing your blood, concentrating the platelets, and injecting them into the scalp. The growth factors in platelets appear to stimulate dormant follicles. A meta-analysis of randomized clinical trials found that PRP-treated areas gained an average of about 28 additional hairs per square centimeter compared to untreated areas. That’s a meaningful improvement, roughly equivalent to what medications achieve, though results vary widely between individuals.
PRP typically requires multiple sessions spaced a month apart, followed by maintenance treatments every few months. It’s not covered by insurance, and costs usually run several hundred dollars per session. It works best as a complement to medication rather than a standalone treatment.
Check for Nutritional Deficiencies
Not all hair loss is hormonal. Telogen effluvium, a type of diffuse shedding, is frequently linked to low iron stores and vitamin D deficiency. In one study, women with iron storage levels (ferritin) at or below 30 ng/mL were 21 times more likely to experience this type of hair loss than women with normal levels. Patients with diffuse hair loss also had significantly lower vitamin D, averaging around 14 ng/mL compared to about 17 ng/mL in controls.
If your ferritin drops below 40 ng/mL and you’re experiencing fatigue, shortness of breath on exertion, or increased shedding, iron supplementation can help reverse the loss. A simple blood test can identify these deficiencies. This type of hair loss is one of the most “curable” forms because once the underlying deficiency is corrected, hair typically regrows fully within several months.
Low-Level Laser Therapy
Laser caps and combs that emit red light in the 630 to 670 nanometer range have FDA clearance for hair loss. The light energy is thought to stimulate cellular activity in hair follicles. Devices delivering light in that specific wavelength range with adequate power output show the best results, according to the American Hair Loss Association. The effects are modest compared to medication, and laser therapy works best when combined with other treatments rather than used alone.
Hair Transplant Surgery
When follicles have been dormant too long for medication to revive them, transplantation is the most definitive option. Two techniques dominate: FUE (where individual follicles are extracted one by one) and FUT (where a strip of scalp is removed from the back of the head and divided into grafts). Both achieve excellent survival rates. In a side-by-side comparison of patients receiving over 2,000 grafts, FUE grafts survived at 99.7% compared to 98.7% for FUT. Hair yield (actual hairs growing from surviving grafts) was 99.1% for FUE and 93.3% for FUT.
FUE leaves no linear scar and allows shorter hairstyles afterward, which has made it the more popular choice. FUT can harvest more grafts in a single session and is sometimes preferred for extensive restoration. Both procedures move hair from the back and sides of the head (areas resistant to DHT) to thinning areas. The transplanted hair is permanent, but you’ll still need medication to protect the non-transplanted hair around it from continued thinning.
Autoimmune Hair Loss Is Different
Alopecia areata, where the immune system attacks hair follicles directly, requires a completely different approach. The FDA has approved a class of medications called JAK inhibitors for this condition. In a Phase II trial, 52% of patients taking the higher dose of baricitinib achieved 80% or greater scalp coverage after 36 weeks, compared to just 3.6% on placebo. About 41% achieved near-complete regrowth. These medications work by calming the specific immune pathway that targets follicles, and they represent a major advance for a condition that previously had limited options.
Treatments in Development
Several new medications are in late-stage clinical trials that could expand options significantly. Topical androgen receptor blockers like clascoterone and pyrilutamide are in Phase III trials. These would block DHT’s effects directly at the follicle without the systemic side effects of oral medications, which could be especially valuable for women and men concerned about sexual side effects.
Cell-based therapies using dermal papilla cells (the cells at the base of each follicle that control hair growth) are in early clinical trials. Exosome treatments have shown promise in animal studies, but clinical data on effectiveness and safety in humans remains insufficient to recommend them. Despite the marketing buzz around exosomes at some clinics, the science hasn’t caught up yet.
Combining Treatments Gets the Best Results
The most effective approach for pattern hair loss is almost always a combination. A typical regimen might include a DHT blocker (finasteride or spironolactone), minoxidil for direct follicle stimulation, and correcting any nutritional deficiencies. Adding PRP or laser therapy on top of that can provide incremental improvement. For areas that are already bald, a transplant fills in what medication can’t regrow, while the medications protect the rest.
The key variable is time. Starting treatment while follicles are still miniaturized but alive gives you the broadest range of options and the best chance of meaningful regrowth. Once follicles have been dormant for many years, transplantation becomes the only path to restoring hair in those specific areas.