What is inside

One: How your hair actually works
The growth cycle, explained properly and without the jargon. Why density, thickness and length are three separate problems that get sold the same solution. What your genetics decide, what your hormones move, and what is genuinely in your hands. Including the honest bit most guides leave out: where the ceiling is.

Two: Working out what is actually happening
Shedding, thinning and breakage feel similar and need opposite responses. You will learn to tell them apart, recognise the four most common patterns, and know the warning signs that mean stop buying products and see a doctor. Plus the blood tests worth asking about, where the research genuinely disagrees, and how to track your own hair with measurements that actually mean something rather than a feeling that it looks worse today.

Three: The life stage map
Your twenties. Your reproductive years and what contraception changes. Pregnancy and the postpartum shed, with the timeline it usually follows. Perimenopause, menopause and beyond. And the ones that arrive at any age: illness, surgery, stress, rapid weight loss and the newer weight loss medications.

Every stage answers the same question. What is most likely happening to you right now, and what would actually help.

Four: What the evidence actually says
Everything graded on one scale: strong evidence, emerging evidence, plausible but unproven, or marketing.

Minoxidil and what the trials genuinely measured. The prescription options and why medical supervision is not a technicality. Devices, microneedling and platelet rich plasma, with the weaknesses in the research named rather than glossed over. Supplements, including why fixing a deficiency and taking a supplement are two different things, and one popular ingredient that can distort your thyroid and heart blood test results. And the myths that will not die.

Five: Twenty five years behind the chair
The part the research papers never cover. What heat, colour and bleach actually damage, and why damage to the hair and damage to the follicle are not the same conversation. The styles that cause loss you cannot reverse. How to cut and colour for the appearance of density. And an honest verdict on fibres, powders and toppers, judged on cost against result.

Six: Your plan
Three routines at three budgets, built only from what holds up. What twelve months of realistic progress looks like, month by month. When to give something up, and when to escalate.

Plus: an ingredient decoder, the questions to take to your GP appointment, a quick reference myth index, and every source referenced in full so you can check my working.