Best Hair Growth Products UK — What Actually Grows Back
Hair loss is the category where snake oil outsells science 10-to-1. We've looked at the ingredients, the evidence, and the fine print to separate the handful of products that genuinely slow hair loss or regrow hair from the £40 serums that smell nice and do nothing else.
Minoxidil — The One With Actual Evidence
Minoxidil is the only topical treatment with consistent clinical evidence behind it for pattern hair loss. It works by increasing blood flow to follicles and extending the growth phase. The 5% foam or liquid is the effective strength for men; 2% is the standard for women. You apply it to the scalp twice daily and it takes 3–6 months to show results — and you have to keep using it, or the regrowth falls out.
The catch: it can cause shedding in the first few weeks (this is normal and temporary), and it works best on the crown and top, less so on the hairline. Generic minoxidil is chemically identical to Regaine and much cheaper — buy the generic 5% and save your money. If you want one product that actually works, this is it.
DHT Blockers — Saw Palmetto and Beyond
Pattern hair loss in men is driven largely by DHT (dihydrotestosterone) shrinking follicles. Finasteride is the prescription option with the strongest evidence, but it's a serious medication with potential side effects — talk to a doctor, don't self-prescribe. The non-prescription angle is saw palmetto, a herbal DHT blocker with modest and mixed evidence; it may help slightly but it's no finasteride.
Hair growth serums often contain caffeine, rosemary oil, or peppermint oil. Rosemary oil actually has a small study showing it matched 2% minoxidil over six months — promising but not conclusive. Caffeine shampoos have thin evidence. Treat 'DHT-blocking shampoo' claims with scepticism — a shampoo is on your scalp for 30 seconds, which isn't long enough to block anything meaningfully.
Biotin Supplements — Mostly Marketing
Biotin (vitamin B7) is heavily marketed for hair growth, but the evidence is weak unless you're genuinely deficient — which is rare. If your diet is reasonable, a biotin supplement won't grow more hair; it'll just give you expensive urine. The cases where biotin helps are specific deficiency, pregnancy, or certain medications — otherwise save your money.
What does matter for hair: iron, vitamin D, zinc, and protein. If your hair is thinning and you're not on a weird diet, get a blood test — iron deficiency and low vitamin D are common, fixable causes of shedding that no serum will address. A decent multivitamin is a safer bet than a pricey 'hair, skin, nails' gummy that's mostly biotin and sugar.
Scalp Care and Realistic Expectations
A healthy scalp helps hair grow — inflammation, dandruff, and product build-up all contribute to shedding. A gentle, fragrance-free shampoo used 2–3 times a week, and not over-washing, keeps the scalp barrier intact. Ketoconazole shampoo (Nizoral) has some evidence as an anti-androgen adjunct for pattern loss — use it 1–2 times a week.
Set realistic expectations. No over-the-counter product regrows a fully receded hairline or a bald crown. Minoxidil and (for men) finasteride slow loss and regrow some. Everything else is supportive. If you want dramatic results, the realistic options are a hair transplant (expensive, £4,000–£15,000) or accepting it. Don't spend £500 on serums hoping for a miracle.
Minoxidil 5% is the only topical with real evidence — buy the generic and use it consistently for 6 months. Saw palmetto and rosemary oil may help slightly. Skip the biotin unless you're deficient. Check iron and vitamin D if you're shedding. And set realistic expectations — OTC products slow loss, they don't reverse baldness.