The hair growth treatment market is enormous, and the gap between what it sells and what the evidence supports is wider here than in any other corner of beauty. Two treatments have serious clinical data behind them. One physical technique dramatically improves how well those two work. Almost everything else is either an adjunct or a well-marketed placebo.
This is a summary of what the research and NHS guidance actually say — not medical advice, and not a substitute for seeing a GP, which is where this should start.
Before Anything: Find Out What Kind of Loss You Have
Losing 50 to 100 hairs a day is completely normal. Beyond that, the cause determines the treatment, and treating the wrong one wastes months.
- Pattern (androgenetic) loss — gradual thinning at the crown or a receding hairline in men, widening parting and diffuse thinning in women. Genetic and hormonal; this is what the licensed treatments target.
- Telogen effluvium — sudden diffuse shedding a few months after illness, surgery, childbirth, rapid weight loss or major stress. Usually reverses on its own once the trigger passes.
- Nutritional — iron deficiency in particular, and it is common. A blood test settles it.
- Thyroid and other medical causes — worth excluding before you spend anything.
- Alopecia areata — defined round patches; an autoimmune condition needing medical treatment.
- Traction and scarring alopecias — from tight styles or inflammatory conditions. Scarring loss is permanent, so early diagnosis genuinely matters.
The NHS is unusually direct about this: see a GP if you are worried, and see them before you visit a commercial hair clinic. A GP can examine your hair, check iron and thyroid levels, and tell you which of the above you are dealing with — for free.
The Evidence, Graded
| Treatment | What the data shows | Timeline | Evidence |
|---|---|---|---|
| Topical minoxidil | Reduces loss or promotes regrowth in around 62% of users after a year; extends the growth phase, works independently of hormones | 3–6 months | Strong |
| Oral finasteride (men) | Halts hair loss in 83–87% of men over two years by lowering DHT | 6–12 months | Strong |
| Microneedling + minoxidil | 91.4 hairs/cm² gained versus 22.2 with minoxidil alone at 12 weeks; 50–75% of people who did not respond to minoxidil or finasteride improved when microneedling was added | 12 weeks+ | Strong as an add-on |
| Low-level laser therapy | Density gains of 6–26 hairs/cm² over 12–26 weeks; FDA-cleared since 2007 for men and 2011 for women | 3–6 months | Moderate |
| PRP injections | Promising, but trial quality is modest; supportive alongside licensed treatment | 3–6 months | Limited |
| Ketoconazole shampoo | Anti-androgenic, reduces scalp inflammation; a useful adjunct | Ongoing | Limited but plausible |
| Biotin supplements, caffeine shampoos | Not recommended as primary treatments by UK clinical guidance | — | Weak |
| FUE hair transplant | The only option that permanently restores hair rather than slowing loss; needs a stable pattern for 12+ months | Permanent | Strong, surgical |
The single most useful number in that table is the microneedling one. If you have tried a licensed treatment and concluded it does not work for you, the research suggests a meaningful chance that adding microneedling changes that — which is a conversation worth having with a clinician rather than a reason to buy a dermaroller online.
The Deal Nobody Mentions Up Front
Every pharmacological option here is maintenance, not cure. The NHS puts it plainly: these medicines “only work for as long as they’re used”. Stop, and the gains reverse over the following months — usually within three to six.
Two consequences worth thinking about before you start:
- Budget for years, not months. A generic private finasteride prescription runs roughly £15–£20 a month in the UK; minoxidil is over the counter and comparable. That is an ongoing cost.
- Start early if you are going to start. These treatments preserve far better than they restore — the hair you keep is worth more than the hair you try to get back.
Also expect a wobble: minoxidil commonly causes a temporary increase in shedding in the first weeks as follicles are pushed into a new cycle. It is well documented and it settles — but it panics a lot of people into stopping at exactly the wrong moment.
What You Can Get, and What It Costs, in the UK
- Minoxidil (2% and 5% topical): available over the counter in UK pharmacies. Ask the pharmacist which formulation suits you — the strengths and licensing differ between men and women.
- Finasteride: prescription only, and most NHS trusts will not fund it for cosmetic hair loss. Private prescriptions via a GP or a regulated telehealth service cost around £15–£20 a month as a generic. It is not licensed for women of childbearing age.
- LLLT devices: caps, helmets and combs, bought privately. Helmets perform slightly better than combs in trials.
- Microneedling: best done in clinic. At-home devices carry a real infection and injury risk, and depth matters.
- PRP: private clinics, several sessions, and the evidence is not yet strong enough to justify it as your only treatment.
- FUE transplant: £3,000–£15,000 privately, never funded by the NHS for pattern loss. Check the surgeon’s GMC registration and the clinic’s CQC status, and expect to stay on medical treatment afterwards to protect the hair you did not transplant.
- Wigs: available on the NHS in some circumstances — synthetic ones last six to nine months, real-hair three to four years.
The LLLT Detail Worth Knowing
If you are considering a laser cap, one finding from the research is counter-intuitive and will save you time: shorter sessions outperformed longer ones. Eight minutes three times a week produced better density gains than longer protocols in the same review.
The plausible explanation is a dose-response curve that peaks and then declines — more energy is not more benefit. Whatever device you use, follow its protocol rather than assuming extra sessions help, and expect modest gains (6 to 26 hairs per square centimetre) over three to six months rather than a transformation.
What the Evidence Does Not Support
- Biotin supplements, unless you have a diagnosed deficiency — which is rare. They can also skew some blood test results, so tell your GP if you take them.
- Caffeine shampoos as a primary treatment. Caffeine has interesting data in leave-on products; a shampoo rinsed out after two minutes is a different proposition, and UK clinical guidance does not recommend them as a treatment.
- Most “hair growth” vitamins. If your diet and bloods are fine, more vitamins do nothing — and some, like excess vitamin A and selenium, can actively cause shedding.
- Rosemary oil as a replacement for medication. The well-known study compared it with the 2% minoxidil formulation, not the stronger one — promising, but not equivalent to treatment.
None of these are harmful in the ordinary sense; they simply occupy the months during which an evidence-based treatment could have been preserving your hair. Our guides to scalp serums and scalp massagers cover what those supportive products realistically deliver.
A Sensible Order of Operations
- See a GP. Get the pattern identified and iron, ferritin and thyroid checked.
- Fix anything treatable — deficiency, thyroid, medication side effects, crash dieting, ongoing stress.
- Sort the scalp out. Chronic inflammation and untreated flaking make everything harder; our scalp care routine guide covers the basics, and ketoconazole shampoo is a useful adjunct here.
- Start a licensed treatment early if the diagnosis is pattern loss, after discussing it with a prescriber.
- Give it six months and review with the person who prescribed it — put the date in your calendar now.
- Consider adding an adjunct — clinic microneedling or LLLT — if the response is partial.
- Only then think about surgery, and only when the pattern has been stable for a year.
See a Doctor Sooner If
- Hair is falling out in defined patches.
- There is scalp pain, sores, scaling or visible scarring where hair no longer grows.
- Loss is sudden and heavy, or comes with fatigue, weight change or other symptoms.
- You are a woman experiencing noticeable thinning — the causes and treatment options differ, and some need specialist input.
- It is affecting your mental health. A GP can refer for counselling, and Alopecia UK runs support groups.
Frequently Asked Questions
How long before I know if a treatment is working?
Three to six months for minoxidil, six to twelve for finasteride. Shedding often increases before it improves. Take standardised photographs at the start — hair changes too slowly for memory to judge.
Can I use minoxidil and finasteride together?
Combination therapy consistently outperforms either alone in the research, because they work on different pathways. Whether it is appropriate for you is a prescriber’s decision, not an internet one.
Is microneedling at home safe?
The impressive results come from controlled protocols, and reviews specifically note that at-home devices carry higher infection and injury risk. If you want the benefit, ask a clinic — and never use a roller on an inflamed or infected scalp.
Will a hair transplant fix it permanently?
Transplanted hair is permanent, but the hair around it is not — pattern loss continues unless it is treated. That is why surgeons ask for a stable pattern and usually recommend staying on medication afterwards. Budget £3,000 to £15,000 and check credentials carefully.
Does stress really cause hair loss?
Yes — telogen effluvium typically appears two to three months after a significant physical or emotional stressor and usually recovers on its own within six to nine months once the trigger has passed. It is diffuse thinning rather than patches, and it is one of the few types that resolves without treatment.
The Bottom Line
Get a diagnosis before you buy anything. If it is pattern loss, the two licensed treatments are the ones with real numbers behind them, they work only while used, and starting early preserves more than waiting ever restores. Microneedling in clinic meaningfully improves how well they work — including for people who thought they had not responded.
Everything else — serums, supplements, shampoos, devices — is supportive at best. Spend on the diagnosis and the evidence first, and treat the rest of your routine, covered in our scalp care routine guide, as the foundation rather than the fix.
