Did you know? Biotin on its own does not work in a shampoo. A biotin-only wash is a strengthening wash with no scalp stimulant, no scalp balance and nothing for fullness. That is why Watermans put seven actives in every wash of Grow Me®: biotin for strength, caffeine to energise the scalp, rosemary to balance it, niacinamide for shine, lupine protein for fuller-looking hair, argan oil for softness and allantoin to calm the scalp. Sulphate-free, vegan, made in the UK, with a 90 Day Money Back Guarantee.
*Independent consumer study of Grow Me® Shampoo, 122 people, three months. Full results on the science page.
The 90 Day Money Back GuaranteeUse it as directed for 90 days and if you are not happy, we refund you.
How it works
Watermans gives backChemotherapy wards have had free Grow Me® from us since 2014, and the nurses there recommend it. Good karma matters to us.
How we give
Real improvements in both my own hair and my clients, from stronger strands to healthier scalp condition with consistent use.
Sarah Sullivan · Certified Trichologist, UK Trichology Clinic, Sheffield
Quality dedicated hair growth treatments such as the Watermans Grow Me range is an excellent starting point to consider. Diligent use for 3 to 4 months can see a reduction in hair thinning and the hope of healthier hair growth.
Dr Anthony Pearce · Specialist Trichologist, Anthony Pearce Trichology, Australia
Watermans products have been a lifesaver for almost every one of our clients. Sulphate free, with no harsh chemicals, and rich in beneficial ingredients such as biotin, caffeine, rosemary, niacinamide and argan oil.
Dr Nick Fisherman · Specialist Trichologist, Hair & Skin Club, Australia
Caffeine
Biotin
Rosemary
Niacinamide
Lupine protein
Argan oil
AllantoinHair does not change in one month. It grows around 1cm a month, and our 122-person study ran for three months. A subscription delivers a fresh set every 30 days at 15% off with free UK shipping, so you never run out mid-routine.
Pause, skip or cancel in two clicks from your account. If it is working, why would you stop?
Caffeine-only shampoos do not work. Grow Me® works as a team, in every wash:
Never with sulphates, parabens or palm oil. The shampoo is vegan. Cruelty-free. Made in the UK. Why sulphate-free matters.
Grow Me® Shampoo: massage into a wet scalp and leave it on for 3 to 4 minutes so the formula can work on the follicles, then rinse. Four washes a week is what the study used.
Condition Me®: on the lengths and ends after every wash, rinse.
Grow More® Elixir: a few drops massaged into the scalp, no rinsing. One bottle of each lasts about 30 days.
Free UK shipping on orders over £45, so the Boost Set always ships free. Dispatched from the UK.
Subscriptions renew every 30 days. Pause, skip, change the date or cancel from your account in two clicks. No phone calls, no emails to chase.
Use as directed and if you are not happy, we will refund you. How it works
Month 1: scalp feels deep-cleaned and refreshed. Hair feels softer and detangles more easily.
Month 2: fewer snapped strands on your brush and pillow. Lengths feel stronger and look shinier.
Month 3: hair looks fuller and feels thicker as less of it breaks. Keep going to keep the result.
Why people trust Watermans
PETABusiness FriendDid you know?
Did you know? Biotin on its own does not work in a shampoo. A biotin-only wash is a strengthening wash with no scalp stimulant, no scalp balance and nothing for fullness. That is why Watermans put seven actives in every wash of Grow Me®: biotin for strength, caffeine to energise the scalp, rosemary to balance it, niacinamide for shine, lupine protein for fuller-looking hair, argan oil for softness and allantoin to calm the scalp.
Biotin shampoo is the second most searched hair growth shampoo in the UK. Biotin earns that reputation as a nutrient. Here is what it does on the strand, what it does from the inside, and why we give you both.
Biotin in a shampoo is there for the strand. Biotin, vitamin B7, is part of the process that builds keratin, the protein hair is made of, and in Grow Me® it goes into the follicle to support the strength and structure of every strand while the shampoo sits on the scalp. It is a strengthening ingredient, not a stimulant.
That is why biotin sits second in Grow Me®, behind caffeine. Caffeine energises the scalp in the first minute; biotin is one of the actives that gets its chance in the three to four minutes after. In our independent study, 83% of 122 users said their hair felt stronger and 82% said it felt thicker after three months of Grow Me®.*
No shampoo makes hair grow, and a biotin shampoo is no exception. The strongest evidence for biotin is as a nutrient: biotin contributes to the maintenance of normal hair, which is an authorised claim for supplements, not for shampoos. In a wash, biotin is a conditioning and strengthening ingredient, and that is the honest claim for it.
Most of the research on biotin and hair looks at people who were short of it, and true biotin deficiency is rare in the UK. So we use biotin two ways: in the shampoo for the strand, and in GrowPro® gummies with zinc for the maintenance of normal hair from the inside. Two gummies a day, sugar-free, vegan.
A biotin-only shampoo is a strengthening wash with no scalp stimulant, no scalp balance and no fullness ingredient. Biotin does one job well. Grow Me® pairs it with caffeine to energise the scalp, rosemary and allantoin to keep it calm and balanced, niacinamide for shine, argan oil for softness and a trialled lupine protein for fuller-looking hair.
Both, if hair is thinning, because they do different jobs. The shampoo puts biotin on the strand and the scalp with six more actives, four to five times a week. GrowPro® gummies give you biotin and zinc, which contribute to the maintenance of normal hair, every day from the inside. Most of our customers who use both start with the shampoo.
GrowPro® is the Watermans supplement: biotin, zinc, vitamin C and silica-rich botanicals in a sugar-free, vegan, mixed-berry gummy. Two a day. If you are pregnant, breastfeeding or on medication, check with your GP before any supplement.
Biotin shampoo suits anyone whose hair feels weak, snaps easily or looks thin at the ends: hair after bleaching and heat, hair through the menopause, hair after pregnancy, and fine hair that never seems to get past shoulder length. Grow Me® was tested on 104 women and 18 men, and it is used by both.
Watermans products are cosmetics. They care for the hair you have and the scalp it grows from. They do not treat hereditary or medical hair loss. If hair is coming out in patches or handfuls, see your GP first.
122 people used unbranded Grow Me® Shampoo four times a week for three months. Here is what they said. See every result.
Caffeine-only shampoos do not work, and neither do biotin-only ones. Grow Me® works as a team: caffeine wakes up the scalp in the first minute, biotin goes into the follicle for strength, and rosemary, niacinamide, lupine protein, argan oil and allantoin each do their own job over the next three. Never with sulphates, parabens or palm oil.
For the formula to work, leave it on the scalp for 3 to 4 minutes before washing out.
What the evidence says
Biotin has a real role in hair. Most of the proof is about biotin as a nutrient, so we give it to you both ways and say so.
Authorised nutrition claim
This is the wording the EU and UK allow for biotin in a supplement, based on its role in normal metabolism. GrowPro® gummies carry biotin and zinc, which both hold this claim.
Why it matters: it is the one biotin claim with regulatory backing, and it applies to the gummy, not the shampoo.
Published research
Biotin is a co-factor in the enzymes that make the building blocks of keratin. Studies showing hair benefit mostly involve people who were short of biotin, which is uncommon in the UK.
Why it matters: a biotin shampoo is a strengthening wash, not a growth treatment, and we describe it that way.
Our own study · 2020
122 people used unbranded Grow Me® four times a week for three months. 83% said their hair felt stronger, 82% said it felt thicker and 83% said it looked fuller.*
Why it matters: this tested the whole shampoo, biotin and all six teammates together.
On the label
Biotin appears on the INCI list of Grow Me® Shampoo and Grow More® Elixir. Not every "biotin shampoo" on the shelf lists it; check the back of the bottle.
Why it matters: if it is not on the ingredients list, it is not in the bottle.
What we do not claim
We do not claim biotin in a shampoo grows new hair or treats hair loss. We claim Grow Me® is a sulphate-free shampoo with biotin and six more actives that most people in an independent study said left their hair feeling stronger, thicker and fuller-looking,* and that GrowPro® gummies provide biotin and zinc, which contribute to the maintenance of normal hair.
Where it sits in the range
Biotin is in the shampoo and the overnight elixir, and in GrowPro® gummies from the inside. The shampoo is the daily habit; the gummies are the two-a-day top-up.
Prices and ingredient lists checked on 12 November 2026 against the INCI list printed on each product. Sets that include these products are listed in the grid below.
Shop the ingredient
Every product below contains biotin. Start with Grow Me®, add the gummies if you want biotin from the inside too, and give it 90 days.
Every photo below was uploaded by the customer with their verified review. We have trimmed some quotes for length. Results vary from person to person.
50 days inCustomer's own photo“After 50 days I am very pleased. My hair might not feel thicker in a ponytail but it looks thicker and you can't see my scalp through my hair any more. I have ordered my second bottle to carry on for the recommended 3 months.”
7 weeks inCustomer's own photo“I've been using this shampoo and conditioner for about 6 to 7 weeks due to my hair randomly thinning. The improvement I've seen already is amazing. My confidence with my hair is much better and I've since purchased the set again and the hair mask.”
7 months inCustomer's own photo“I've been using this shampoo and conditioner for 6 to 7 months now and the difference in my hair is amazing. The condition of my coloured blonde hair is amazing, no breakage, super soft. I love it that much I bought the salon size in both.”
Long-term userCustomer's own photo“Rapid weight loss after surgery caused dramatic hair loss. I truly thought I was going to go bald. Then I discovered Watermans and won't use any other shampoo and conditioner. My hair is in beautiful condition, it's thicker than ever and I couldn't be happier.”
First weekCustomer's own photo“I haven't been using this product for a week yet and I'm already seeing improvement. My hair is fuller, it's glossy. I also have scalp psoriasis and it hasn't bothered me at all since I've been using this product.”
2 years inCustomer's own photo“I have been using Watermans for over 2 years and the proof is in my photos. I was a tape hair extension person for years so my hair was damaged and short with ratty ends. Now everyone asks me what I use.”
Repeat buyerCustomer's own photo“I had very thin hair before this shampoo. My hair is so healthy and thick now. I don't want to use any other shampoo but Grow Me.”
The real cost of the routine
Grow Me® works on its own. People who get the best results use all three, every wash, every night. Here is what the full routine costs either way.
Prices checked November 2026. Free gifts are added automatically at checkout while stocks last.
£53.40£45.39 a delivery · £1.51 a day
The complete hair loss routine, delivered before you run out. Use all three together for optimal results and give it the full 90 days.
Every Watermans formula is built on ingredients with their own test data, combined so they work on the scalp and the strand together.
Our actives are tested by the labs that make them. Our lupine protein was tested in the lab and on volunteers by our ingredient manufacturer. Caffeine, biotin, rosemary and niacinamide are among the most studied hair ingredients there are.
Our lupine protein is a trademarked active from our ingredient manufacturer: a hydrolysed lupine protein rich in peptides, trace elements and vitamins. It is in Grow Me® Shampoo and Grow More® Elixir.
Most shampoos lean on one hero ingredient. Grow Me® combines caffeine, biotin, rosemary, niacinamide, lupine protein, argan oil and allantoin, so the scalp and the strand are looked after in the same wash.
We have watched thousands of hair loss brands and products come and go, every one claiming to combat hair loss. Since 2012 Watermans has sold 6.5 million bottles, won a Queen's Award for Enterprise and run a three-month consumer study on 122 people. We are still standing. We must be doing something right.
Ingredient tests are carried out by the ingredient manufacturer. Our own three-month consumer study of Grow Me® covered 122 people.
FAQs
Watermans products are cosmetics. They are not medicines and do not treat medical hair loss. If your hair is falling out suddenly, in patches, or you are worried, please see your GP or a trichologist first. Prices, stock and ingredient lists on this page were checked on 12 November 2026.
Biotin shampoo works as a strengthening wash: biotin supports the structure of the strand, and in our independent study 83% of 122 Grow Me® users said their hair felt stronger. It does not make hair grow and no shampoo does. The nutrient claim for biotin applies to supplements such as GrowPro® gummies.
Biotin shampoo is good for strength, not growth. Biotin builds keratin, so it supports the strand you already have. For a hair growth shampoo you also want a scalp stimulant, which is why Grow Me® pairs biotin with caffeine, rosemary, niacinamide, lupine protein, argan oil and allantoin in every wash.
Biotin can help hair feel thicker by supporting the structure of each strand. In our three-month study 82% of Grow Me® users said their hair felt thicker and 83% said it looked fuller.* Those are consumer perception results for the whole shampoo, not a measurement of biotin alone.
If your hair is thinning, yes, because the shampoo and the gummy do different jobs. GrowPro® gummies contain biotin and zinc, which contribute to the maintenance of normal hair, two a day, sugar-free and vegan. Check with your GP first if you are pregnant, breastfeeding or on medication.
Yes, because the conditioner closes the lengths that the shampoo has strengthened. Grow Me® Shampoo carries biotin; Condition Me® carries caffeine, rosemary and the lupine protein active and detangles so less hair snaps in the comb. The set is £26.95 together.
Three to four minutes on a wet scalp, four to five washes a week. The contact time is the point: a shampoo that is rinsed straight off is a detergent and a perfume. Massage it in with your fingertips, leave it, then rinse and condition the lengths.
In an independent three-month home-use study of unbranded Grow Me® Shampoo, 72% of users said their hair loss had noticeably slowed, 83% said their hair looked fuller, 82% said it felt thicker and 83% said it felt stronger. These are consumer perception results, not a clinical trial, and we say so on every page.
Grow Me® Shampoo is vegan and cruelty-free, made in the UK, and formulated without sulphates, parabens or palm oil. Every Watermans product except Condition Me® conditioner is vegan. No Watermans product is tested on animals.
Yes. The 90 Day Money Back Guarantee covers your first order of Grow Me®, Condition Me®, Grow More®, Masque Me® and Protect Me®. Use the product as directed for 90 days and, if you are not happy, we refund it. Hair grows around a centimetre a month, so 90 days is the honest minimum to judge any routine.
A kiss of life for hair
*Based on an independent consumer study of 122 people (104 women, 18 men) who used unbranded Grow Me® Shampoo four times a week for three months. Consumer perception results: the percentages are the share of users who agreed with each statement. Individual results vary. Ingredient research described on this page is published research into the ingredient, or the ingredient manufacturer's own tests of the active on its own, not tests of the finished Watermans products. Watermans products are cosmetics, not medicines, and do not treat medical hair loss. Prices, ingredient lists and review counts checked on 12 November 2026.
