Stopping hair loss starts with figuring out why it’s happening. The two most common types, genetic thinning and stress-triggered shedding, look different, have different causes, and respond to different treatments. Only two medications are FDA-approved for pattern hair loss (minoxidil and finasteride), but nutritional gaps, daily habits, and newer procedures can all play a role depending on your situation.
Hair grows in cycles: an active growth phase lasting two to eight years, a brief breakdown phase of two to four weeks, and a resting phase of two to four months before the hair falls out and a new one begins. This is why every treatment takes months to show visible results. You’re waiting for follicles to cycle back into growth mode.
Identify Your Type of Hair Loss First
The approach that works depends entirely on what’s driving the loss. The two most common types have distinct patterns that you can often spot yourself.
Genetic hair loss (androgenetic alopecia) is gradual. In men, it typically starts above the temples and thins across the top of the head over years or decades, often leaving a ring of hair along the sides and back. In women, hair thins diffusely across the entire scalp without the hairline pulling back. It rarely leads to complete baldness in women, but it can become noticeably thin, especially along the part line.
Stress-triggered shedding (telogen effluvium) looks different. Hair falls out all over the scalp, and you might lose 300 to 500 hairs per day compared to the normal 50 to 100. It usually starts about three months after a triggering event: surgery, childbirth, a high fever, a thyroid imbalance, starting or stopping birth control, or even a significant vitamin deficiency. The good news is that this type is almost always temporary once the trigger is resolved.
The Two FDA-Approved Medications
Topical minoxidil and oral finasteride remain the only two FDA-approved treatments for pattern hair loss. Everything else is either off-label, supplemental, or procedural.
Minoxidil
Minoxidil (the active ingredient in Rogaine) is available over the counter as a liquid, foam, or spray. It works by increasing blood flow to the follicle and extending the growth phase of the hair cycle. Both men and women can use it. If it’s going to work for you, expect to use it for several months before seeing new growth. If nothing has changed after four months of consistent daily use, it’s likely not effective for your hair loss pattern.
The most common side effect is scalp irritation. Some people also notice fine hair growth on the forehead or face, especially with the liquid formula. You have to keep using it indefinitely; stopping will reverse any gains within a few months.
Finasteride
Finasteride (sold as Propecia) is a prescription pill approved for men only. It works by blocking the enzyme that converts testosterone into DHT, the hormone responsible for shrinking hair follicles in genetic hair loss. It’s effective for slowing loss and, in many cases, regrowing some hair. The trade-off is that a small percentage of men experience sexual side effects, including reduced libido or erectile changes. These typically resolve after stopping the medication, though a controversial condition called post-finasteride syndrome involves persistent symptoms in rare cases.
Check for Nutritional Gaps
Low iron is one of the most common nutritional contributors to hair shedding, particularly in women. In one study, women with stress-triggered hair loss had average ferritin levels (the protein that stores iron) of just 16.3 ng/mL, compared to 60.3 ng/mL in women without hair loss. Women with ferritin at or below 30 ng/mL had 21 times the odds of experiencing this type of shedding. If you’re losing hair diffusely and you menstruate heavily, eat a limited diet, or have been through a recent physical stress, getting your ferritin checked is a practical first step.
Whether iron supplementation alone reverses hair loss isn’t fully established, but correcting a deficiency removes a known trigger. Your doctor can check ferritin with a simple blood test.
Biotin is heavily marketed for hair growth, but the evidence is thin. Cleveland Clinic notes there isn’t enough research to definitively say biotin helps grow hair. One small study showed improvement in women who took a multivitamin containing biotin, but the supplement had other ingredients too, making it impossible to credit biotin alone. If you’re not actually deficient in biotin (most people aren’t), supplementing is unlikely to change much. Zinc, vitamin D, and vitamin B12 deficiencies have also been linked to hair loss, so a broad blood panel is more useful than guessing which supplement to buy.
Add-On Treatments Worth Knowing About
Ketoconazole Shampoo
Ketoconazole is an antifungal ingredient found in shampoos like Nizoral, available at 1% over the counter and 2% by prescription. Beyond treating dandruff, there’s evidence it disrupts DHT activity directly at the scalp. Research suggests that the 2% formula can inhibit DHT production or block it from binding to receptors in the follicle. It won’t replace minoxidil or finasteride, but using it two to three times a week as your regular shampoo can complement those treatments. Think of it as reducing the hormonal assault on your follicles from another angle.
Microneedling
Microneedling the scalp with a derma roller or derma pen creates tiny punctures that stimulate the skin’s wound-healing response, which can wake up dormant follicles. A study of 60 patients with moderate to severe genetic hair loss tested biweekly microneedling combined with 5% minoxidil over 12 weeks. Both the 0.6 mm and 1.2 mm needle depths improved hair count, but the shallower 0.6 mm depth actually produced significantly better results. If you try this at home, a 0.5 to 0.6 mm roller used every two weeks is a reasonable starting point. Wait at least 24 hours after microneedling before applying minoxidil to avoid irritation.
Platelet-Rich Plasma (PRP)
PRP involves drawing your blood, concentrating the platelets, and injecting the solution into the scalp. A small study of 11 people with genetic hair loss found that PRP injections every two weeks for three months increased the average number of follicular units from 71 to 93 per area measured. It’s promising but expensive, typically costing $500 to $1,500 per session with multiple sessions needed, and it isn’t covered by insurance. Results vary widely between individuals.
Daily Habits That Protect Your Hair
No daily habit alone will reverse genetic hair loss, but several can reduce unnecessary shedding and support the treatments you’re using.
Scalp massage has limited but intriguing evidence behind it. A small study found that nine men who performed daily scalp massage saw an increase in individual hair strand thickness after six months. The theory is that mechanical stimulation increases blood flow and may influence gene expression in the follicle. Four to five minutes a day with moderate finger pressure is the general approach used in these studies. It’s free, has no side effects, and may provide a small benefit alongside other treatments.
Heat styling, tight hairstyles (ponytails, braids, buns worn in the same position daily), and aggressive towel drying all cause mechanical damage that accelerates loss. If your hair is already thinning, switching to a silk pillowcase, letting hair air dry when possible, and wearing looser styles reduces the physical stress on weakened follicles. Chemical treatments like bleaching and relaxing also weaken the hair shaft and can worsen thinning.
Set Realistic Expectations on Timing
Because the hair growth cycle includes a resting phase of two to four months before a new hair even begins growing, no treatment produces fast results. Most people need three to six months of consistent use before they can fairly judge whether something is working. Taking photos in the same lighting every four weeks gives you a more objective record than relying on what you see in the mirror day to day.
If your hair loss is stress-triggered, it will often resolve on its own within six to nine months once the underlying cause is addressed. If it’s genetic, the goal shifts to slowing the loss and maintaining what you have. Starting treatment earlier, when thinning is just beginning, consistently produces better outcomes than waiting until significant loss has occurred. Follicles that have been dormant for years are much harder to revive than those that recently started miniaturizing.