Hair loss: myths vs what the evidence says

Medically reviewed by Muhammad A Jalil, Superintendent Pharmacist (GPhC Reg No: 2236161)

Published 2026-08-22 · Clinically reviewed 2026-08-22 · Updated 2026-08-23

Baldness from your mother's side? Hats and washing to blame? The common hair loss myths, and the two treatments the evidence actually supports.

Most of what gets repeated about hair loss is false. Baldness is not handed down only through your mother's side; hats, gels and frequent washing do not kill follicles; shaving does not thicken regrowth; and no supplement or caffeine shampoo regrows a receding hairline. The truth is less mysterious: male pattern hair loss is a hormonal process — follicles genetically sensitive to DHT shrink over years — and the two treatments with consistent trial evidence are finasteride, which lowers DHT, and minoxidil, which prolongs the follicle's growth phase. Everything else is either a niche case or noise.

Myth 1: baldness comes from your mother's father

The grain of truth: one important gene, the androgen receptor, sits on the X chromosome, which men inherit from their mothers. But large genetic studies have linked well over two hundred genetic regions to male pattern loss, spread across chromosomes from both parents. Your father's hairline is at least as informative as your grandfather's. Heritability is high — this is mostly a genetics story — but no single relative tells it.

Myth 2: hats, washing and styling damage follicles

Follicles are fed by blood from below, not by air from above — a hat would need to be tight enough to cut circulation for hours daily to matter, which no wearable hat is. Washing removes hairs that had already detached; the drain after shampooing looks dramatic precisely because loose hairs accumulate between washes. Gels and waxes coat the shaft, which is dead material growing from a follicle several millimetres below the skin. The one mechanical cause that is real: chronic tight traction — braids, tight buns, extensions — which genuinely scars follicles over years.

Myth 3: shaving makes hair grow back thicker

Cutting hair changes its tip, not its root. A regrowing shaft has a blunt end that feels coarser and looks darker against the skin, and that is the entire illusion. Measured in studies going back to 1928, shaving changes neither density nor diameter nor growth rate.

Myth 4: stress made my hair fall out for good

Severe stress, illness, high fever or rapid weight change can trigger telogen effluvium: a diffuse shed starting two to three months after the event, alarming in the shower and on the pillow. It is usually temporary — many follicles were pushed into their resting phase together, and they typically recover over six to twelve months. The pattern also differs from male pattern loss: thinning all over rather than temples and crown. Patchy, coin-shaped loss is different again — alopecia areata, an autoimmune condition — and warrants a clinical review rather than pattern-loss treatment.

Myth 5: supplements and special shampoos regrow hair

Biotin only helps the rare person who is genuinely deficient. Iron and vitamin D are worth checking when shedding is diffuse — correcting a deficiency can stop that kind of shedding — but no vitamin reverses pattern loss in a well-nourished man. Caffeine shampoos rest on laboratory studies, not convincing trials in people. Rosemary oil has one small trial against low-strength minoxidil; interesting, but not a treatment plan. A useful rule: no shampoo or supplement has ever earned a medicines licence for regrowing hair.

What the evidence actually supports

Two medicines, ideally started early while follicles are shrunken rather than gone. Finasteride, a daily tablet, lowers DHT: in five-year data, around nine in ten men maintained or improved their hair counts, and roughly two-thirds saw visible regrowth. Results build slowly — our finasteride timeline guide maps the 3, 6 and 12-month picture. Minoxidil, a topical foam or solution, prolongs the growth phase and thickens miniaturised hairs; it works independently of hormones and pairs additively with finasteride. Both are commitments: gains hold only while treatment continues, and reverse over about a year if you stop. Hair transplants relocate DHT-resistant follicles but do not stop loss elsewhere on the scalp, which is why most surgeons insist on medical treatment alongside. Prescription treatment starts with an online assessment — you can check your eligibility for hair loss treatment in a few minutes.

Frequently asked questions

Can a bald area be fully reversed?

Recently thinned areas respond best, because the follicles there are miniaturised rather than dead. Areas that have been smooth for years rarely regrow with medicine alone — which is why acting early matters more than any product choice.

Do I need blood tests before treating hair loss?

Classic male pattern loss — gradual temples-and-crown thinning, often with affected relatives — is usually diagnosed from the pattern alone. Diffuse shedding, patchy loss, or hair loss alongside fatigue or skin changes deserves checks (thyroid, iron, vitamin D) before reaching for pattern-loss treatment.

Does the gym or creatine raise DHT and speed up balding?

The evidence is thin — a single small creatine study reported a DHT rise and has never been replicated. Lifting weights does not bald anyone; genetics run this show. If gym-related shedding coincides with a harsh cut in calories, suspect the diet instead — rapid weight loss is a classic trigger for temporary diffuse shedding.

Are results permanent?

While treatment continues, largely yes — five-year data show maintained benefit for most men. Stop, and DHT resumes its work: expect the gained ground to reverse over roughly a year. The practical takeaway: build the tablet or foam into a routine you can genuinely sustain, because consistency — not intensity — is what the five-year curves reward.