







Leave-In Hair Density Serum – Overnight Scalp Elixir
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While you sleep, your hair should be working.
Most hair products wash out within minutes — but your scalp needs longer than that, especially with visible thinning at the hairline, the crown, or a patch that never seems to recover. Watching a specific area thin is disheartening.
What it needs is a treatment that stays on — targeting those areas directly, working all night, without another step in your morning routine.
Grow More® Elixir is Watermans' high-strength leave-on hair loss serum — a hair growth scalp serum for the areas you need it most. Applied before bed and left overnight: no rinsing, no fuss. The UK's most trusted hair growth range, with over 5 million bottles sold since 2012 and the only UK haircare brand to win the Queen's Award for Enterprise.
How to use it
Apply a small amount directly to thinning or lower-density areas before bed, massage gently into the scalp, and leave overnight — no need to rinse. For best results, use alongside Grow Me® Shampoo and Condition Me® Conditioner.
Key ingredients & what they do for your hair
- Biotin — a building block of keratin, the protein that forms every strand; known for supporting hair strength.
- Caffeine — studied for refreshing and energising the scalp at the surface.
- Rosemary Extract — researched for supporting scalp comfort and a balanced environment.
- Niacinamide — known for improving shine and manageability.
- Allantoin — known for soothing and comforting the scalp.
- Hydrolysed Lupine Protein (ANAGELINE®) — supports hair-fibre resilience and helps reduce breakage.
- Argan Oil — nourishes and helps protect against dryness.
Sulphate-free. Paraben-free. Palm oil-free. Vegan. Cruelty-free. Made in the UK.
Rosemary Extract
Biotin
Niacinamide
Allantoin
Lupine Protein (ANAGELINE®)
Hair Growth Shampoo: What Dermatologists Want You to Know
The average human head loses between 50 and 100 hairs per day. When that number creeps higher, it is not always genetics — it is often a signal that the scalp environment has deteriorated. A clinically informed hair growth shampoo addresses this by restoring the conditions that follicles need to function at full capacity. The hair growth cycle consists of three phases: anagen, catagen, and telogen. Effective thinning hair treatment works by extending the anagen phase and reducing premature entry into telogen, which is the resting phase where shedding occurs. Ingredients like caffeine have been shown in published dermatological studies to prolong anagen by counteracting the effects of 5-alpha reductase and testosterone at the follicular level. This is why ingredient selection matters far more than brand promises.
The UK Hair Loss Crisis in Numbers
According to the NHS, androgenetic alopecia affects approximately 50 percent of men over 50 and 50 percent of women over 65 in the United Kingdom. But the conversation around hair loss solutions has shifted dramatically in the past decade. Younger demographics — women in their twenties and thirties dealing with postpartum shedding, iron deficiency, and stress-related telogen effluvium — now represent the fastest-growing segment seeking hair thickening products. The demand for non-pharmaceutical, natural hair growth products has surged because people want results without the side effects associated with finasteride or the inconvenience of topical minoxidil. The best shampoo for hair growth in this new landscape is one that bridges the gap between cosmetic haircare and clinical scalp therapy.
Ingredient Hierarchy: What Separates Effective Hair Regrowth Treatment from Marketing
Not all actives are equal and not all formulations deliver them effectively. A hair regrowth treatment should be evaluated on three criteria: penetration, concentration, and synergy. Rosemary oil is a good example. A 2015 randomised comparative trial published in SkinMed found that rosemary oil applied over six months produced hair count increases comparable to 2 percent minoxidil. But this only works when the rosemary extract is formulated to remain on the scalp long enough to absorb. Biotin operates differently — it reinforces the keratin matrix that forms the physical structure of each strand, making it essential in any hair strengthening shampoo. Hydrolysed lupine protein fills a third role by bonding to micro-fractures in the hair cuticle, physically reducing the breakage that makes thinning visible. When these three mechanisms work in concert — follicle stimulation, structural reinforcement, and cuticle repair — the result is a genuine scalp treatment for hair loss rather than a cosmetic illusion.
Why Shampoo Alone Is Not Enough: The Case for a Complete System
The scalp is only in contact with shampoo for two to three minutes per wash. That is a narrow window for active delivery. This is precisely why leading trichologists recommend a layered approach. A hair growth shampoo opens the cuticle and deposits the first wave of actives. A conditioner seals them in while adding structural proteins that create immediate hair thickening. A hair density serum or overnight hair growth serum then provides sustained release of nutrients during the eight to ten hours of sleep when cell turnover and follicular activity peak. This three-tier system is the basis of every credible natural hair thickening treatment protocol used in clinical settings. For men, a complete hair growth kit for men removes the complexity of assembling individual products and ensures the correct ratios of actives are applied at each stage.
The Female Hair Loss Gap
Women's hair loss has been historically underserved by the industry. Most early hair loss solutions were developed for male pattern baldness and then remarketed to women without reformulation. The result is products that are either too aggressive for the female scalp or too weak to produce meaningful change. A shampoo for thinning hair women actually benefit from needs to account for hormonal fluctuations, the impact of pregnancy and breastfeeding on nutrient stores, the damage caused by colouring and heat styling, and the increased sensitivity that often accompanies female pattern thinning around the temples and parting line. Gentle does not mean ineffective — it means the formulation respects the biology while still delivering active concentrations that produce visible improvement in hair density and retention over a 90-day cycle.
How to Evaluate Hair Loss Products Before You Buy
The UK market is saturated with hair thickening products making claims they cannot substantiate. Before investing in any thinning hair treatment, apply three tests. First, check whether the active ingredients have peer-reviewed research supporting their use for hair. Caffeine, rosemary, biotin, and lupine protein all do. Most proprietary blends with trademarked names do not. Second, look at the brand's track record. A company that has sold over five million units and holds a Queen's Award for Enterprise has been subject to a level of scrutiny that newer brands have not. Third, read reviews from verified purchasers who have used the product for at least three months — hair operates on a cycle, and any honest hair regrowth treatment will set that expectation rather than promising overnight transformation. The best natural hair growth products earn loyalty through transparency and consistent results, not aggressive marketing.
Watermans Grow More® Elixir is a leave-in hair loss serum and overnight scalp treatment — a sulphate-free UK hair growth serum that absorbs without grease to support a healthy scalp and fuller, denser-looking hair over time, applied exactly where you need it.
Why an Overnight Scalp Serum?
Healthy-looking hair starts at the scalp — but a shampoo only acts for the few minutes it's on your head. If you're watching a specific area thin at the hairline, the crown, or a patch that never seems to recover, a few minutes in the shower won't turn it around. A leave-on serum keeps working through the night, exactly where you apply it.
Grow More® Elixir is built for targeted, around-the-clock support — no medical treatments, no rinsing, no fuss.
What It Does
- Lightweight, fast-absorbing and non-greasy
- Supports a refreshed, balanced scalp environment
- Targets thinning or lower-density areas directly
- Works overnight, between washes
- Suitable for all hair types, for men and women
- Sulphate-free, paraben-free, cruelty-free, and vegan
Key Ingredients for Hair Growth
- Biotin: A building block of keratin — the protein that forms each strand — known for supporting hair strength.
- Caffeine: Studied for refreshing and energising the scalp at the surface.
- Rosemary Extract: Researched for supporting scalp comfort and a clean, balanced environment.
- Niacinamide: Known for improving manageability, shine, and condition.
- Hydrolysed Lupine Protein (ANAGELINE®): Supports hair-fibre resilience and helps reduce breakage.
- Argan Oil: Nourishes and helps protect against dryness.
How to Use
Apply a small amount of the hair loss serum directly to thinning or lower-density areas of the scalp in the evening. Massage in gently and leave on overnight — no need to rinse. Use consistently, ideally alongside Grow Me® Shampoo and Condition Me® Conditioner, for best results.
Did You Know?
- A leave-on serum beats the shower clock. Shampoo only acts for the few minutes it's on the scalp — a leave-in serum keeps supporting the area for hours, which is why it's applied overnight.
- Target the area, not the whole head. This serum is designed to be applied precisely where density is lower — the hairline, crown or a specific patch.
- Biotin is a building block of keratin, the protein that forms each strand, which is why it's associated with stronger hair.
- Caffeine works at the scalp surface to refresh and energise the area around the follicle.
- Hair grows in cycles, so use it nightly for at least 8–12 weeks before judging results.
Hair Loss Serum FAQs
How long before I see results?
Hair grows on a cycle, so apply nightly for at least 8–12 weeks before judging results. Many notice a calmer, healthier-feeling scalp sooner. Results vary from person to person.
Where do I apply it?
Directly onto thinning or lower-density areas of the scalp — the hairline, crown, or any patch you want to target. A small amount is enough.
Do I rinse it out?
No — it's a leave-in. Apply before bed, massage in, and leave overnight.
Will it regrow hair on bald areas?
Grow More® is a non-medical cosmetic scalp serum: it supports a healthy scalp and the hair you have, and helps reduce breakage. It doesn't treat hereditary or medical hair loss — for that, please see your GP or a trichologist.
Can I use it with the shampoo and conditioner?
Yes — it's designed to complete the Grow Me® routine. Wash with the shampoo, condition, and use the serum overnight.
Is it vegan and cruelty-free?
Yes — sulphate-free, paraben-free, palm oil-free, vegan, cruelty-free, and made in the UK.
Support Your Hair Overnight
Make every night count. Click Add to Cart and target thinning areas while you sleep.
TESTED - PROVEN - TRUSTED
All testimonials are by real people and may not reflect the typical purchaser’s experience and are not intended to represent or guarantee that anyone will achieve the same or similar results.
Grow Me Consumer Study
*Claims data based on a study of 104 Females and 18 Males using a blank label
unbranded bottle of Grow Me Shampoo 4 times per week for 3 months.
Full report available on request to Dr's and Government departments only.
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