A clean, evidence-led shampoo formulated to support thicker, healthier hair. Caffeine, Saw Palmetto, Biotin and Rosemary. Nothing you don't need.
Walk down any haircare aisle and you'll see the same story dressed up a hundred ways: surfactants for foam, silicones for slip, fragrance to mask the rest. It looks busy. It feels luxurious. But the actual ingredients that move the needle on hair health? Often missing entirely.
Thinning isn't only a cosmetic problem. It's a biological process driven by hormones (DHT), inflammation, follicle dormancy and nutritional gaps. A shampoo can't solve all of it — but it can stop making it worse, and it can do real, evidence-backed work where it counts.
Most haircare promises everything. We picked three jobs and built around them — defending against loss, kickstarting growth, and keeping what's already there in good shape.
Caffeine and Saw Palmetto work at the follicle to interrupt the internal triggers behind hair miniaturisation — the slow process that makes existing strands progressively finer over time.
Biotin supports keratin formation; Rosemary essential oil increases circulation at the scalp to wake dormant follicles — backed by clinical comparison to leading topical treatments.
Aloe Vera and Pro-Vitamin B5 (Panthenol) lock in moisture and reinforce the strand — so hair feels thick and resilient straight out of the shower, not stripped or coated.
Six ingredients carry the weight of the formula. Each one is in the bottle for a measurable reason — selected from the literature, not the marketing playbook. The rest of the list does its job quietly: lather, preserve, suspend, soothe.
The full INCI list, in order. We don't bury anything in proprietary blends or "natural fragrance" because there's nothing to bury. If you want to know what's in your shampoo and what each part is doing, here it is.
Formulated and bottled in the United Kingdom in small batches. Cosgard preservation. pH balanced for the scalp at 5.0–5.5.
Our promise. If we list it, it earns its place. Every preservative, surfactant and emulsifier here is doing necessary work — chosen for its safety profile and tolerability, not just because it's legal.
Three to four times a week is the sweet spot. Daily is fine if your scalp tolerates it. Consistency outperforms intensity — every time.
We started Thickly because haircare had quietly given up on doing the work — and gotten very good at hiding it.
Thickly is a small, independent UK brand built on a single conviction: that a shampoo can — and should — do real, measurable work for your hair. Not just clean it. Not just smell nice. Actually support the biology of growth.
Every formula choice we make starts with the literature and ends in a bottle. We pick ingredients with evidence behind them, leave out the ones that exist purely for marketing, and put the full INCI list on the front of the page instead of the back of the bottle.
It's a slower way to build a brand. It's also the only one that's honest.
I've tried every "natural" shampoo on the market and most leave my hair feeling stripped or weirdly waxy. This one doesn't. Six weeks in and the hair around my temples actually looks fuller.
Honestly the reason I bought it. Reading the full INCI right there on the website, not having to dig for it — that's already saying something. The product itself is excellent. My hair feels light but thick.
This is the bit no one gets right. Every other sulphate-free shampoo I've used barely foams. This one builds a proper lather and rinses clean. Subscribed after the first bottle.
One bottle lasts approximately 60 washes. Subscribe and we'll send a fresh bottle every 8 weeks — pause, skip or cancel any time.
If something isn't here, we'd rather hear from you than have you guess. Real reply, from a real person, usually within a working day.
The hair growth cycle works on a scale of months, not weeks — so we'd ask for at least 8 to 12 weeks of consistent use before judging effects on density. Most people notice changes to scalp feel and hair texture within the first two weeks.
Yes. The surfactant system is built around decyl glucoside and cocamidopropyl betaine — both gentle enough for daily use. That said, for most people 3–4 washes per week is plenty and gives the actives time to work.
Absolutely. The mechanisms here — DHT inhibition, follicle stimulation, scalp health — are universal. Female pattern thinning is also driven significantly by androgen sensitivity. Thickly is formulated for any adult dealing with thinning, shedding or just wanting to support healthy hair.
Yes — sulphate-free formulas like ours are actually preferred for colour-treated hair because they don't strip pigment the way harsher cleansers do. Wait the standard 48 hours after a fresh colour before first use.
UK, Ireland and the EU at the moment. Free UK shipping on orders over £30. Tracked delivery typically arrives in 2–3 working days. International coming soon — join the list at the bottom of the page to be first to know.
60 days, no questions. If you've used it, given it a fair run and it isn't right for you, email us and we'll refund the bottle. We'd rather you find something that works than feel stuck with us.