To see effective results, it's recommended to use a hair-thickening serum daily or as directed by the product. Consistent use will help achieve noticeable improvements in thickness and strength. For sensitive scalps, start with a few times a week and gradually increase the frequency.
If you're looking to add volume, density, and fullness to your hair, a high-quality hair thickening serum can be a game changer.
These serums are formulated with active ingredients like biotin, keratin, caffeine, and panthenol, which work together to stimulate hair growth, strengthen individual strands, and improve overall thickness. Whether you have fine, thin, or lifeless hair, the right serum can provide the boost and support your hair needs to look fuller and more vibrant.
In this guide, we’ve carefully selected and reviewed the 13 best hair thickening serums available. These products offer proven results, from increased volume to enhanced texture, helping you achieve a thicker, healthier-looking mane.
Table of content
1. Best Hair Thickening Serums
2. How to choose the best hair-thickening serum?
3. Conclusion
4. FAQs
Best Hair Thickening Serums
Here are the top 13 hair thickening serums of 2025, according to our test:
🔹 Best Overall: Bio-Pilixin Activation Serum by Scandinavian Biolabs – A top choice for thickening hair with active ingredients that help boost scalp circulation and hair health.
🔹 Best for Daily Use: Hydrating Argan Oil Daily Hair Serum by Forte Series – Combines the benefits of hydration and hair thickening, with nourishing argan oil for daily application.
🔹 Best for Scalp Therapy: PURA D'OR Hair Thinning Therapy Energizing Scalp Serum – Works to energize the scalp, promote thickening, and reduce thinning over time.
🔹 Best for Hair Density: The Ordinary Multi-Peptide Serum for Hair Density – A powerful serum with multiple peptides designed to increase hair density and thickness.
🔹 Best for Biotin-Enriched Serum: Pureauty Naturals Biotin Hair Serum – A biotin-packed serum that helps promote thicker and healthier-looking hair.
🔹 Best for Strengthening: Sephora Strengthening Hair Serum – Fortifies hair with essential nutrients, making it thicker, healthier, and more manageable.
🔹 Best for Growth & Thickness: Camille Rose Ultimate Growth Serum – Specially formulated to promote healthy hair growth while improving the appearance of thin hair.
🔹 Best for Natural Ingredients: Votala Hair Growth Serum – A natural and potent formula that helps thicken hair while supporting hair growth.
🔹 Best for Restoring Volume: SheaMoisture Jamaican Black Castor Oil Hair Serum – A restorative serum that nourishes the hair and scalp to create thicker, fuller hair over time.
🔹 Best for Volume Boosting: Boldify Hair Boost Serum – A lightweight serum that enhances volume and thickness while making the hair look fuller.
🔹 Best Vegan Hair Serum: Vegamour GRO Hair Serum – A plant-based serum that promotes thicker, fuller hair through a blend of natural ingredients.
🔹 Best for Multi-Use: Blu Atlas Hair & Body Oil – A versatile serum that works for both hair and body, promoting thickness while also moisturizing the skin.
🔹 Best for Smoothing and Thickening: Kiehl's Smoothing Oil-Infused Leave-in Concentrate – Provides sleekness and thickens hair, leaving it with a soft, manageable texture.
1. Bio-Pilixin Activation Serum
The Bio-Pilixin® Serum from Scandinavian Biolabs is designed to help combat hair thinning and promote growth, using advanced stem cell technology and plant growth factors.
Clinically tested, it improves blood circulation to the scalp, delivering essential nutrients. Notably, 93% of users in a clinical study reported satisfaction with its results within 45 days.
This vegan serum is made with high-quality ingredients, including Capilia Longa®, which significantly reduces hair loss and increases hair density.
Niacinamide strengthens hair by boosting keratin, and Vanillyl Butyl Ether enhances nutrient delivery with a warming scalp sensation.
The Bio-Pilixin® Serum also comes with a 150-day money-back guarantee, ensuring customer satisfaction and confidence in its effectiveness.
2. Hydrating Argan Oil Daily Hair Serum by Forte Series
The Hydrating Argan Oil Hair Serum by Forte Series, tailored for men, is a remarkable choice for those looking to thicken and strengthen their hair daily.
This serum, which is free from sulfates and parabens, leverages the benefits of argan oil to not only hydrate but also enhance hair volume and fullness.
It's an excellent option for men who frequently style their hair with heat or have sun-damaged hair, acting as a protective pre-styler and a rejuvenating serum. Reducing dryness and controlling frizz makes hair more manageable and appear thicker.
The serum's appealing fragrance and hassle-free rinse-off formula make it a convenient addition to any hair care routine.
For best results in hair thickening, apply a small amount to damp hair before using heat styling tools, followed by your regular styling products.
3. PURA D'OR Hair Thinning Therapy Energizing Scalp Serum
With its clinically validated formulation, the PURA D'OR Hair Thinning Therapy Energizing Scalp Serum targets reducing hair thinning due to breakage and aims to boost hair volume.
This potent serum blends 16 key active components, including niacin, biotin, argan oil, and various antioxidants.
These ingredients work in synergy to cleanse the scalp and support the growth of hair that is robust, healthy, and resilient. It's designed for daily use and is gentle enough for all hair types, even color-treated.
4. The Ordinary Multi-Peptide Serum
Peptides, vital amino acids for hair growth and strength, are crucial in hair thickening serums, such as the Ordinary Multi-Peptide Serum for Hair Density.
This serum incorporates powerful peptides like CAPIXYL and Procapil, which not only promote hair growth but also aid in reducing hair loss. Additionally, it strengthens the scalp and nails.
The advantages of this serum include its quick absorption and light fragrance, making it user-friendly.
To use, apply a few drops to a clean, damp scalp daily, ideally before bedtime. Massage gently until it's fully absorbed; there's no need to rinse it off.
Key ingredients in this serum include Peptides, Biotin, Caffeine, and Hyaluronic Acid, all contributing to its hair-thickening properties.
5. Pureauty Naturals Biotin Hair Serum
The Pureauty Naturals Biotin Hair Serum is a potent, naturally formulated hair-thickening solution. It works on damp and dry hair, boosting shine and minimizing frizz.
Key ingredients like biotin, pea sprout extract, pisum, and pro-vitamin B5 nourish hair follicles, reinforcing the roots and leaving hair soft and healthy.
This serum is versatile and practical for all hair types. For optimal results in hair thickening, use just a tiny amount (2–3 drops) and apply it directly to the scalp.
Gently massaging it in allows for better absorption and maximizes its strengthening effects. Incorporate this serum into your routine for noticeably fuller, stronger hair.
6. Sephora Strengthening Hair Serum
The Sephora Strengthening Hair Serum is a unique, nutrient-packed formula available exclusively at Sephora.
Infused with biotin and plant proteins, it's especially effective for fine hair and suitable for various hair types, including straight, wavy, curly, and coily.
This vegan and cruelty-free serum is also gluten-free, comes in recyclable packaging, and is ideal for addressing hair thinning, damage, and straightening.
A study revealed that 95% of users noticed more resilient hair, with 85% experiencing a stronger scalp.
7. Camille Rose Ultimate Growth Serum
This hair-thickening serum for women leverages the revitalizing properties of amla oil and Brahmi herbs to unclog hair follicles and invigorate the scalp.
It combines sesame and coconut oils with golden jojoba and olive fruit extracts, providing deep hydration and reducing hair breakage.
The serum's delightful chocolate and honey scent complements its non-oily feel, while its nutrient-rich formula promotes thicker, healthier hair growth and improved blood circulation in the scalp.
8. Votala Hair Growth Serum
The Votala Hair Growth Serum is a practical, organic option for both men and women, focused on stimulating hair growth.
This formula contains vitamin E, fleece flower root, angelica, ginger, niacinamide, and danshen salvia sclarea extract.
These components work together to rejuvenate inactive hair follicles, making it a powerful ally against alopecia. It nourish the scalp and fosters the development of fuller, more robust hair.
9. SheaMoisture Jamaican Black Castor Oil Hair Serum
SheaMoisture's Jamaican Black Castor Oil is an exceptional hair-thickening serum, especially beneficial for curly and wavy hair types. It's adept at controlling frizz and is suitable for all hair textures.
Ideal for those who frequently use heat styling tools or have chemically treated hair, this serum deeply moisturizes, enriching the scalp and hair with essential nutrients.
It promotes thicker, stronger hair and leverages peppermint's stimulating effects on the scalp.
10. Boldify Hair Boost Serum
The Boldify Hair Boost Serum, enriched with biotin, is expertly crafted to enhance hair density and health while sidestepping the side effects often linked to hair loss treatments.
This robust formula blends 30 natural botanicals with four clinically proven peptides to improve scalp health, nourish follicles, increase strand resilience, and stimulate growth.
Ideal for all hair types, it provides an effortless application and noticeable outcomes. Its unique blend ensures a lightweight, non-greasy texture for softer, fuller hair.
11. Vegamour GRO Hair Serum
This hair thickening product aims to diminish hair loss and increase hair volume, utilizing natural components like nutrient-dense mung bean, curcumin derived from turmeric, and red clover's antioxidant qualities.
The brand indicates that users may notice more voluminous hair within three to four months with daily use.
The serum is presented in an eco-friendly glass bottle, showcasing the brand's commitment to sustainability.
12. Blu Atlas Hair & Body Oil
Blu Atlas distinguishes itself in hair and skincare with its premium products featuring clean, vegan ingredients like saw palmetto, argan, and sweet almond oil.
Saw palmetto oil, known for its anti-inflammatory benefits, fights hair loss while adding hydration and volume.
Argan oil, packed with vitamin E, fatty acids, and antioxidants, rejuvenates damaged hair and reduces frizz. Sweet almond oil protects hair from UV damage. Regular use of Blu Atlas products yields transformative results.
13. Kiehl's Smoothing Oil-Infused Leave-in Concentrate
This hair-thickening serum, enriched with argan oil, is an excellent solution for combating frizzy, dry hair. It's specifically formulated to not only manage unruly hair but also to enhance its thickness and shine.
The serum is versatile – apply it to damp hair as a styling aid for shaping and volumizing as it dries, or use it on dry hair to add a quick burst of shine and fullness.
It's the perfect tool for achieving smooth, thick, and glossy hair whenever needed.
Why you can trust Scandinavian Biolabs?
As your leading source for hair health information over the past 4 years, we never compromise on accuracy. When it comes to your health, you deserve information you can truly rely on - and earning your trust is our top priority.
Here's how Scandinavian Biolabs ensures every piece of content meets the highest standards of accuracy and integrity:
- Credentialed Experts: Our reviewers are actively practicing doctors and medical researchers
- Stringent Reviews: Content undergoes rigorous editing by subject specialists and review by a practicing doctor.
- Evidence-Based: We rely on well-established research from trusted scientific sources like peer-reviewed journals and health authorities.
- Full Transparency: Our editorial standards, writer credentials, reviewer credentials, correction process, and funding are all publicly documented.
- Independent Voice: While we do promote products, we operate in a vacuum to business operations. Our main goal is just an unwavering commitment to providing medically-sound guidance.
You can count on Scandinavian Biolabs to consistently deliver the trustworthy health information you deserve. Read our Editorial Standards.
How to choose the best hair-thickening serum?
To choose the best hair-thickening serum, consider the following:
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Hair Type: Identify if your hair is fine, curly, thick, or color-treated to pick a serum tailored to your needs.
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Key Ingredients: Look for biotin, keratin, peptides, and oils like argan or castor oil to promote thickness.
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Formula Texture: Choose a lightweight, non-greasy serum for everyday use.
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Reviews: Check user experiences for effectiveness and potential side effects.
Conclusion
This article explored the world of hair-thickening serums, highlighting their importance in enhancing hair volume and strength.
When choosing a serum, key considerations include recognizing your hair type, looking for essential ingredients like biotin and keratin, preferring a formula that aligns with your texture preferences, and consulting user reviews for real-world insights.
From understanding how these serums work to examining specific products, we provide a comprehensive guide to help you make an informed decision in selecting the best hair-thickening serum for your unique hair needs.
FAQs
What are the main benefits of using a hair-thickening serum?
The main benefits of using a hair-thickening serum are increased volume, fullness, and improved hair texture. These serums nourish and strengthen the hair, reduce breakage, and can promote hair growth, leading to visibly thicker, healthier hair over time.
Can hair-thickening serums be used on all hair types?
Yes, hair-thickening serums can be used on all hair types, including fine, curly, thick, or color-treated hair. However, it’s important to select a serum that suits your specific hair type to achieve the best results, such as lightweight formulas for fine hair or more intense formulas for thicker hair.
How often should I use a hair-thickening serum for effective results?
References:
- https://www.ncbi.nlm.nih.gov/books/NBK547751/
- https://pubmed.ncbi.nlm.nih.gov/28879195/
- https://health.clevelandclinic.org/is-biotin-as-good-as-advertised-for-your-hair-loss/
- https://www.aad.org/dw/dw-insights-and-inquiries/archive/2021/biotin-supplementation-hair-nails
- https://www.medicalnewstoday.com/articles/319427
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5582478/
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