Application takes about 30 seconds. Simply shake the bottle gently over thinning areas, starting from the crown and working forward. Tap lightly to let the fibres settle, then finish with 4–6 light mists of our Locking Spray to secure them in place all day. For precision around the hairline, use our Easy Apply Fibre Pump. Check our How To Use page for step-by-step video tutorials for both men and women.

No. Our cotton fibres are completely undetectable, even in bright sunlight and under close inspection. Unlike keratin fibres that can look chalky or obvious in certain lighting, CottonWrap™ fibres blend seamlessly with your natural hair texture. Most of our 30,000+ customers tell us that nobody can tell they’re using anything at all.

Yes. Once secured with our Locking Spray, Hair Guru fibres are resistant to rain, sweat, and wind. They’ll hold up through your gym session, a rainy commute, or a long day outdoors. The fibres stay in place until you wash them out with regular shampoo.

Simply wash your hair with any regular shampoo. The fibres rinse out completely with no residue or build-up over time. There’s no special removal process needed.

We offer 14 shades to match virtually every hair colour. The easiest way is to use our free AI Colour Match Scanner — just open it on your phone, scan your hair, and get your perfect shade in 10 seconds. If you prefer, you can also browse all shades on our shade selection page. When in doubt, go slightly darker rather than lighter for the most natural result.

Yes. Hair Guru fibres work on all hair types including straight, wavy, curly, and afro-textured hair. The cotton fibres grip onto any hair texture and stay in place. They’re effective for thinning on the crown, receding hairlines, widening parts, and general volume loss.

Absolutely. Our fibres are made from natural cotton with no harsh chemicals, synthetic dyes, or irritants. They’re dermatologist-friendly and safe for daily use, even on the most sensitive skin. The formula is also vegan and cruelty-free.

Our standard 28g bottle lasts most people 1–2 months with daily use, depending on the area of coverage. For lighter touch-ups, it can last even longer. We also offer a 100g Refill Pouch for those who want better value, and a 5g Sample Size if you’d like to try it first or carry one for on-the-go touch-ups.

We strongly recommend it. While the fibres grip well on their own, the Locking Spray adds an extra layer of hold that keeps everything secure through rain, wind, and sweat. It also adds a natural-looking sheen. Apply 4–6 light mists from about 20cm away and let it dry for one minute.

Hair Fibres: Gossypium Herbaceum (Cotton) Fiber, Silica, CI 77499, CI 77491, CI 77492. Varies slightly by shade.

Locking Spray: Aqua, PVP/VA Copolymer, Propylene Glycol, Panthenol, Phenoxyethanol, Ethylhexylglycerin, Parfum.

All ingredients are cosmetic-grade and safety-tested. No parabens, no sulfates, no animal-derived ingredients.

Yes. Hair Guru London products work equally well for men and women. Hair thinning affects everyone differently, and our fibres adapt to any hair length, style, or texture. We have separate application tutorials for men and women on our How To Use page.

We offer free UK delivery on all orders. Standard delivery takes 2–4 business days. All orders are dispatched in discreet, plain packaging with no indication of the contents. You’ll receive a tracking number by email as soon as your order ships.

We offer a 30-day money-back guarantee. If you’re not completely satisfied with your purchase, contact us at our contact page and we’ll sort it out. We want you to feel confident in your purchase, and we stand behind every product we make.

Once your order is dispatched, you’ll receive an email with a tracking number and link. You can use this to follow your delivery in real time. If your tracking hasn’t updated after 48 hours, feel free to get in touch and we’ll look into it for you.

Yes. All transactions are processed through Shopify’s secure checkout with 256-bit SSL encryption. We never store your card details. We accept all major credit and debit cards, Apple Pay, Google Pay, and Shop Pay.