1. Diagnosis comes before treatment
Hair loss is a symptom with many causes, and treating it without knowing the cause is why so much money is wasted in this category.
Pattern hair loss, driven by genetics and hormonal sensitivity, is the most common form and progresses gradually. Telogen effluvium is diffuse shedding several months after a trigger such as illness, surgery, childbirth, severe stress or a crash diet, and it usually resolves once the trigger has passed. Alopecia areata is an autoimmune condition producing discrete patches. Scarring alopecias destroy the follicle permanently and are a medical emergency in the sense that delay costs hair that cannot come back. Hair loss can also be a sign of thyroid disease, iron deficiency or other systemic illness.
These require different responses, and one of them requires urgent medical attention. Anybody experiencing significant hair loss should see a GP before buying anything, and should ask specifically about thyroid function and iron status. A supplement bought online cannot distinguish between these conditions, and neither can a website.
2. Nutrition, where the evidence is conditional
Hair follicles are metabolically demanding and among the first structures to be affected by a nutritional shortfall. This gives the nutritional argument a genuine foundation, and the foundation has a limit that the supplement market systematically ignores.
Iron. Iron deficiency is a recognised contributor to hair loss and is particularly common in women of reproductive age. Where deficiency is identified by testing, correcting it is appropriate and can improve hair. Where it is not, iron supplementation is not benign: excess iron accumulates and causes harm. Iron should be taken on the basis of a blood test, not a hunch.
Protein. Hair is largely protein. Severely restricted eating and crash dieting are recognised triggers for shedding. Adequate protein intake matters; additional protein beyond adequacy does not produce additional hair.
Vitamin D and zinc. Both have been associated with hair loss in deficiency states. Both follow the same pattern set out in our vitamin D review and our zinc review: correcting deficiency matters, supplementing above adequacy does not, and both have upper limits worth respecting.
Biotin. The most oversold ingredient in the category. Biotin deficiency is rare and does cause hair and nail problems. In people who are not deficient, which is almost everybody, there is no good evidence that supplementation improves hair. High dose biotin also interferes with several common laboratory tests, including thyroid and cardiac assays, and can produce misleading results with real clinical consequences. Anybody taking high dose biotin should tell any clinician arranging a blood test.
Vitamin A. Worth stating plainly because it runs in the opposite direction: excess vitamin A causes hair loss. A supplement stack containing several products with vitamin A can reach a harmful intake without anybody intending it.
3. Botanical treatments
Saw palmetto. The proposed mechanism overlaps with that of a licensed oral medicine for pattern hair loss, which is what generated interest. Small human studies exist, tend to be short and of low methodological quality, and independent replication at scale is missing. There is also a point of logic that the natural framing obscures: if the mechanism is genuinely similar to the pharmaceutical, then the side effect profile of that pharmaceutical deserves the same consideration. Plant origin does not exempt a compound from its own mechanism, as set out in why natural does not mean safe.
Rosemary oil. Very widely promoted on social media on the basis of a small number of small human comparisons. Those studies are a legitimate starting point and they are not a conclusion. Small, short, single-site work is exactly the shape of evidence that later fails to replicate. Rosemary oil also causes contact dermatitis in some people and must be diluted; undiluted essential oil on the scalp is a route to irritation, not to hair.
Onion juice, caffeine preparations, pumpkin seed oil and similar. Each has a small literature, usually a single small study or a handful, typically without meaningful controls. None is established. The pattern across all of them is identical: one small promising study, extensive amplification, no replication.
4. Scalp practices
Scalp massage is proposed to increase blood flow and mechanically stimulate follicles. The human evidence is minimal and the studies are very small and poorly controlled. Massage is pleasant, free and carries essentially no risk, which is a perfectly reasonable basis for doing it. It is not evidence that it works.
Microneedling of the scalp has a more interesting evidence base, mostly in combination with conventional topical treatment rather than alone, and it is a procedure with real risks when performed with unsterile equipment at home. This is a clinical procedure rather than a natural remedy, and readers should treat it as such.
Two things that genuinely help and are rarely mentioned because nobody sells them: stop traction. Tight ponytails, braids, extensions and weaves cause traction alopecia, which becomes permanent if sustained. And treat heat and chemical processing as a limited resource.
5. What does have evidence
For pattern hair loss, the treatments with the strongest evidence are conventional. A topical agent and an oral agent are licensed in the UK for this indication and have substantial trial bases behind them, having been assessed by a regulator. Both have limitations, require continuous use to maintain any benefit, and carry side effect profiles that need discussing with a prescriber. Neither is available on the NHS for cosmetic hair loss, and both should be obtained through a pharmacist or a prescriber rather than an unregulated overseas seller.
This site's position is not that natural approaches are worthless and pharmaceuticals are the answer. It is that the evidence sits where it sits, and a reader deserves to be told that the well evidenced options for pattern hair loss are the licensed ones, rather than being sold a supplement stack because it is easier to buy.
6. Clinic based treatments
A growing number of clinics offer injectable and energy based treatments for hair loss, including platelet preparations derived from a patient's own blood and, more recently, various regenerative preparations. The evidence across this category is uneven. Platelet based treatment has a moderate and genuinely mixed literature, complicated by the fact that preparation protocols differ between clinics, which makes trials difficult to compare. Newer regenerative offerings are frequently marketed well ahead of their evidence.
Providers in this space include medical clinics offering assessment alongside treatment. Mesglo London is one named example of a London clinic operating in this area, and it appears here as a single named example rather than as a recommendation. The disclosure below sets out the basis on which it is named. Anyone considering clinic based treatment should ask what the specific evidence is for the specific protocol offered, how many sessions are required, what the maintenance schedule is, and what the total cost over two years amounts to.
7. Cost
UK prices in this category vary widely. Supplement products marketed for hair commonly range from around fifteen pounds to around sixty pounds a month, and we would not recommend that spend for anyone without an identified deficiency. Licensed topical and oral treatments generally range from around ten pounds to around forty pounds a month depending on route of purchase. Clinic based injectable treatments typically range from a few hundred pounds per session upwards, usually across a course.
The useful discipline is to price the total over two years, because every effective option in this category requires continuation.
8. Our position
Graded Limited overall. See a GP before buying anything, and ask about thyroid function and iron. Correct identified deficiencies and do not supplement above adequacy, particularly with iron and vitamin A. Treat single small studies circulating on social media as the starting point they are. Stop traction. And understand that the best evidenced treatments for pattern hair loss are conventional, licensed and unexciting, which is what good evidence usually looks like.