Can hair serum regrow hair? The short answer is that only serums with proven active ingredients such as minoxidil or specific plant-based complexes have shown potential to support visible regrowth over time.
But which ingredients do you have to look for? In this guide explores which hair growth serums actually support regrowth and how you can recognise them. We highlight evidence-based ingredients, real-world results and explain how to integrate them into your routine.
Whether you have fine, dry, or damaged strands, you'll learn how to choose a serum that promotes stronger, healthier hair and visible improvement over time.
Table of content
Key Takeaways
- Not all hair serums regrow hair: Only specific hair serums with clinically studied ingredients such as minoxidil or certain plant-based actives have shown potential to support visible improvement.
- Check for an active ingredient: Only serums with clinically supported active ingredients are likely to regrow hair.
- Scalp health is critical: Serums that improve blood flow and follicle health are most likely to stimulate regrowth.
- Consistency matters: Results often require 3–6 months of regular use.
- Allow for a testing period: Most serums require a testing period of at least 12 weeks to monitor the results.
- Hair type varies the outcome: Fine, wavy, or damaged hair may respond differently to serums.
- Consult professionals: NHS GPs or dermatologists can guide personalised treatment plans.
- Amino Acids: Provide essential building blocks for keratin and collagen production, helping to strengthen hair structure and support overall growth.
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Can Any Hair Serum Regrow Hair?
Not all serums promote new hair growth. Only specialised hair growth serums—formulated with active ingredients such as minoxidil, peptides, or plant-based extracts like pea sprout extract or Capilia Longa® are designed to help support healthy follicles and create conditions that may encourage regrowth when used consistently.
How Do Hair Serums Work for Regrowth?
Hair serums target hair follicles to stimulate growth, improve scalp health and reduce hair shedding by influencing different phases of the hair cycle, such as prolonging the anagen (growth) phase.
Ingredients like minoxidil increase blood flow to follicles, extending the hair growth cycle. Peptides and plant extracts, like those in The Ordinary Multi-Peptide Serum, play a key role in strengthening hair follicles and supporting new hair growth.
However, efficacy depends on the cause of hair loss (e.g., male pattern baldness, stress, or hormonal changes).
What Ingredients Should You Look For?
Key ingredients that have been clinically studied for their potential to support hair regrowth include (with each serum often featuring a key ingredient that drives its effectiveness):
- Minoxidil: Licensed by the MHRA, stimulates follicles and promotes thicker hair.
- Peptides: Strengthen the hair shaft and improve follicle health.
- Rosemary Oil: Enhances scalp circulation, reducing hair fall.
- Pea Sprout Extract: Supports new hair growth and density.
- Biotin: Boosts keratin production for stronger hair.
- Capilia Longa® (Curcuma longa stem-cell extract): A turmeric-derived complex shown in studies to help reduce hair fall and support visible density.
- Niacinamide (Vitamin B3): Supports scalp balance and helps maintain a healthy environment for active follicles.
- Caffeine: Stimulates the scalp and helps keep follicles active.
- Aloe Vera: Provides soothing and hydrating benefits that promote overall scalp comfort.
- Avoid serums with harsh chemicals that may cause scalp irritation or greasy residue.
Which Hair Serums Are Clinically Proven to Regrow Hair?
Serums like Regaine (minoxidil), The Ordinary Multi-Peptide Serum and Vegamour GRO are backed by clinical studies for hair regrowth as hair growth treatment options.
Top Clinically Proven Hair Serums
These are some of the best hair growth serums available for supporting hair health and stimulating growth:
Regaine (Minoxidil 5%):
- Best for: Male pattern baldness, receding hairlines.
- How it works: Increases blood flow to follicles, extending the growth phase.
- Results: Visible regrowth in 3–6 months with daily use.
- Best for hair types: Fine, thinning, or wavy hair.
The Ordinary Multi-Peptide Serum for Hair Density:
- Best for: Overall scalp health, hair density.
- How it works: This scalp serum uses peptides and plant extracts to strengthen follicles and improve scalp health.
- Results: Testers report fuller hair after a 12-week testing period.
- Best for hair types: Dry, damaged, or bleached hair.
- Best for: General hair thinning, stress-related loss.
- How it works: Formulated with plant-based actives, including Capilia Longa® (Curcuma longa stem-cell extract), Niacinamide and Caffeine, the Bio-Pilixin® Serum is designed to help maintain active follicles and support scalp balance without hormones or drugs.
- Results: In a 150-day third-party clinical study with 30 participants (men and women aged 18–65), 77% reported reduced hair loss after 45 days, 93% showed clinically tested reduction in shedding after 150 days and 73% experienced measurable increase in hair density. Suitable for daily use on clean, wet or dry scalps; users often notice less shedding in 2–4 weeks.
- Best for hair types: All types, including fine, dry, or damaged hair; non-greasy and dermatologist-approved formula minimises irritation.
Vegamour GRO Hair Serum:
- Best for: Hormonal hair loss, postpartum thinning.
- How it works: Plant-based formula with pea sprout extract reduces shedding.
- Results: Improved hair thickness in 90 days.
- Best for hair types: Fine or wavy hair.
How to Choose the Right Serum for Your Hair Type
When choosing a serum, it's important to consider different hair textures to ensure the product meets your specific needs.
- Fine Hair: Lightweight, non-greasy serums like The Ordinary prevent build-up.
- Dry or Damaged Hair: Hydrating serums with rosemary oil or biotin help reduce hair breakage and improve overall hair resilience.
- Wavy or Bleached Hair: Serums with frizz control and strengthening ingredients work best.
- Thinning Hair: Minoxidil-based serums target follicle health and regrowth.
How Long Does It Take for Hair Serums to Show Results?
Most serums require 3–6 months of consistent use to show noticeable regrowth, with early signs like reduced shedding in 4–8 weeks, which is often observed during the testing period as improvements in the tester's hair.
Understanding the Hair Growth Cycle
Hair grows in three phases: anagen (growth), catagen (transition) and telogen (resting), which together make up the hair cycle. Serums target the anagen phase to extend growth and reduce hair fall.
Factors like male pattern baldness or hormonal changes can slow results, requiring a consistent testing period to properly evaluate efficacy.
Tips for Maximising Results
- Apply correctly: Use on a clean, dry scalp for better absorption. Some serums can also be applied to wet or dry hair for added convenience.
- Be consistent: Follow product instructions (e.g., daily or twice daily).
- Combine with a hair care routine: Use gentle shampoos and avoid heat styling to support healthy hair growth.
- Monitor progress: Look for new baby hairs or less hair fall as early signs. Noticing more baby hairs and when your hair feels healthy are also positive indicators of improvement.
- Can Hair Serums Address Specific Hair Loss Causes?
Yes, but efficacy depends on the cause—serums can address hair loss and may promote hair growth depending on the underlying issue. For example, minoxidil works for androgenetic alopecia, whilst peptide-based serums may help support scalp health associated with stress or nutritional factors.
Common Causes of Hair Loss
- Male Pattern Baldness: Genetic, often presents as a receding hairline, responds well to minoxidil. The NHS recommends minoxidil as a first-line treatment.
- Hormonal Changes: Postpartum or menopausal thinning benefits from plant-based serums.
- Stress or Nutritional Deficiencies: Peptide serums and biotin improve hair follicle health.
- Scalp Issues: Dry scalp or irritation needs hydrating serums with rosemary oil.
When to Consult an NHS GP or Dermatologist
If serums don't yield results after 6 months, consult your GP. They may recommend:
- Blood tests to check for deficiencies (available free on the NHS).
- Prescription treatments like oral minoxidil or finasteride.
- Referral to an NHS dermatologist or private trichologist for complex cases like severe hair thinning.
The NHS can also assess whether hair loss might be related to underlying conditions such as thyroid problems, anaemia, or polycystic ovary syndrome (PCOS).
Are There Risks or Side Effects of Hair Serums?
Most serums are safe, but minoxidil may cause scalp irritation and some serums leave greasy residue or trigger allergies; using too much hair oil or serum can also weigh down the hair shaft.
Common Side Effects
- Minoxidil: Itching, redness, or flaking (use on dry scalp to minimise). The MHRA-approved patient information leaflet provides full details on potential side effects.
- Plant-based Serums: Rare allergies to ingredients like rosemary oil.
- Overuse: Build-up on scalp, leading to clogged follicles and negatively affecting hair texture.
How to Minimise Risks
- Patch test new serums to avoid irritation.
- Follow application instructions (e.g., 2–3 drops for scalp serums), as using the correct amount of scalp serum helps avoid irritation.
- Choose products suited for your hair type to prevent greasy residue.
- If you experience persistent side effects, consult your pharmacist or GP.
How Do Hair Serums Fit Into a Hair Care Routine?
Serums should be applied after cleansing and before styling, ideally on a dry scalp, to maximise absorption and efficacy; incorporating a hair growth serum into your routine can help maintain a healthy scalp and support optimal hair growth.
Building a Hair Care Routine for Regrowth
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1Cleanse:
Use a gentle, sulfate-free shampoo to clean the scalp without stripping oils.
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2Apply Serum:
Massage 2–3 drops of serum into the scalp, focusing on thinning areas. This helps promote hair growth and supports the appearance of thick hair.
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3Moisturise:
Use a lightweight conditioner for dry or damaged hair.
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4Protect:
Avoid heat styling and use UV-protectant products for bleached or wavy hair, particularly during the UK's summer months.
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5Maintain Scalp Health:
Incorporate weekly scalp massages to boost circulation and improve hair strength.
Complementary Products
Consider using additional hair growth products, such as serums or topical treatments, to support healthier hair and enhance your routine.
- Hair Oils: Rosemary or argan oil for added hydration.
- Supplements: Biotin or collagen for overall hair health (available at Holland & Barrett, Boots, or Superdrug).
- Scalp Scrubs: Exfoliate to remove build-up and improve serum absorption.
What Are the Limitations of Hair Serums?
Serums can't reverse severe hair loss or regrow hair in permanently damaged follicles; some users may notice less hair in certain areas, whilst others may see more hair or improved hair growth in thinning spots and results vary by individual.
When Serums May Not Work
Whilst hair serums are a popular hair growth treatment, their effectiveness can be limited for certain hair textures, especially when clinical studies show varying results across different hair types and curl patterns.
- Advanced Baldness: Areas with no follicles won't respond.
- Underlying Conditions: Thyroid issues or autoimmune disorders require medical treatment.
- Inconsistent Use: Skipping applications reduces efficacy.
Alternative Hair Loss Treatments
- PRP Therapy: Platelet-rich plasma injections stimulate follicles.
- Laser Therapy: Low-level laser therapy improves scalp circulation. Some NHS trusts offer this, or it's available privately.
- Hair Transplants: Surgical option for permanent regrowth. UK clinics offer consultations, with procedures typically costing £3,000–£10,000 depending on extent.
FAQs
Do hair growth serums really work?
Yes, hair growth serums can be effective when they include clinically supported ingredients that stimulate the scalp and strengthen hair follicles. Serums containing actives such as minoxidil, caffeine, peptides, or Capilia Longa® have been shown to help reduce hair loss and encourage visible regrowth with regular use. Patience and consistency are essential for best results.
Do hair serums work for all hair types?
Yes, hair serums can benefit every hair type—including fine, curly, straight, or coily strands—but results depend on choosing the right formula. Lightweight, silicone-free serums suit fine or oily hair, whilst richer, hydrating blends help dry or textured hair. Matching ingredients to your hair's needs ensures optimal growth support and shine.
Can I use hair serums with other treatments?
Yes, most serums can be combined with treatments like minoxidil, essential oils, or supplements, but it's wise to consult your GP or pharmacist first. This helps prevent ingredient conflicts or scalp irritation, especially if you're using prescription medications or chemical treatments for hair loss.
How often should I apply hair serums?
Many hair growth serums are designed for daily use—either once or twice a day—on clean, dry or slightly damp scalp. Consistency is key; regular application helps maintain active ingredients around follicles for stronger, healthier hair over time.
Are natural serums as effective as minoxidil?
Natural serums with ingredients like rosemary oil, caffeine, or peptides can nourish the scalp and reduce shedding, but they generally cannot match the clinically proven regrowth results of minoxidil. They're best for early thinning or maintenance rather than treating significant hair loss. The NHS recognises minoxidil as having the strongest clinical evidence.
Can hair serums cause hair fall?
Hair serums rarely cause hair loss directly, but misuse—such as applying excessive product, skipping washes, or reacting to allergens—can lead to scalp build-up and shedding. Always patch test first and follow the manufacturer's instructions to minimise irritation and maintain scalp health.
Which hair serums actually regrow hair?
Minoxidil-based serums like Regaine are MHRA-approved, proven to support hair growth in 60-80% of users after 3-6 months. Scandinavian Biolabs Bio-Pilixin® Activation Serum, with Capilia Longa™, supports hair growth with 93% reduced loss and 73% denser hair in 150 days, ideal for natural regrowth in mild thinning.
Are hair serums good for your hair?
Yes, hair serums can be good for your hair when applied properly. They shield the hair from heat and pollution, reduce frizz, and enhance shine. Some advanced formulas also include active ingredients that nourish the scalp and encourage healthier hair growth. Always select a serum designed for your hair type and use it in moderation to prevent residue.
What is better, hair serum or hair oil?
Hair serum and hair oil each have unique benefits, so the best choice depends on your hair concerns. Serums are lightweight, protecting the hair from heat, humidity, and daily damage while adding shine. Oils, on the other hand, provide deeper hydration and help restore dry or damaged strands. Many people find that combining both — serum for protection and oil for nourishment — delivers the most balanced results.
Sources
- Patel P, Nessel TA, Kumar D. (2023). Minoxidil. National Library of Medicine. Read the book
- Majeed M, Majeed S, Nagabhushanam K. (2020). Clinical Study to Evaluate the Efficacy and Safety of a Hair Serum Product in Healthy Adult Male and Female Volunteers with Hair Fall. Clin Cosmet Investig Dermatol, 13:691–700. doi:10.2147/CCID.S271013 Read the study
- Hoover E, Alhajj M, Flores JL. (n.d.). Physiology, Hair. National Library of Medicine. Read the book
- Gloucestershire Hospitals NHS Foundation Trust. (n.d.). Minoxidil for hair loss (Patient information leaflet GHPI1649_01_24). Read the information
