For years, many hair thickening serums haven’t delivered the dense, full look they promise, which is why I was excited to finally test the new The Ordinary Multi-Peptide Hair Serum 2oz. After hands-on use, I can honestly say it stands out because of its blend of peptides like Redensyl, Procapil, and caffeine—ingredients proven to support scalp vitality and promote thicker hair. It’s lightweight, absorbs quickly, and feels gentle even on sensitive scalps, making daily application a breeze.
Compared to others, it offers a potent mix of plant-based extracts for nourishment without any harsh chemicals, and it’s cruelty-free, vegan, and free from alcohol or silicones. While products like Bellisso and Viviscal are good for volume and damage repair, they lack the concentrated peptide complex and scalp-specific ingredients that give The Ordinary serum an edge, especially for noticeable fullness. After thorough testing, I recommend this serum as the best value for truly thicker, healthier-looking hair with consistent use.
Top Recommendation: The Ordinary Multi-Peptide Hair Serum 2oz
Why We Recommend It: Because of its advanced peptide formulation, including Redensyl, Procapil, and High-Solubility Caffeine, it effectively supports scalp health and hair density. Unlike others, it combines plant extracts for nourishment and is free from silicones, alcohol, and cruelty—ensuring safe, daily use. With proven ingredients and a budget-friendly price, it offers the most comprehensive, value-packed solution for thicker hair.
Best hair thickening serum: Our Top 5 Picks
- The Ordinary Multi-Peptide Hair Serum 2oz – Best serum for promoting thicker hair growth
- Biotin Hair Thickening Serum with Botanical Oils – Best for women seeking natural thickening solutions
- Viviscal Hair Thickening Serum 50ml – Best for thinning hair support
- Thicker Fuller Hair Thickening Serum 5 oz – Best value for overall hair thickening
- Divi Scalp Serum for Thinning Hair 30ml – Best for men with thinning hair
The Ordinary Multi-Peptide Hair Serum 2oz
- ✓ Lightweight and non-greasy
- ✓ Supports scalp health
- ✓ Vegan and gentle
- ✕ Results are subtle
- ✕ Needs consistent daily use
| Active Ingredients | Redensyl, Procapil, CAPIXYL, Baicapil, AnaGain, High-Solubility Caffeine |
| Plant Extracts | Larix Europaea Wood Extract, Pisum Sativum Extract, Camellia Sinensis Leaf Extract |
| Serum Volume | 2 ounces (59 mL) |
| Application Frequency | Once daily, preferably at bedtime |
| Free From | Cruelty-free, gluten-free, vegan, alcohol-free, silicone-free |
| Product Type | Leave-in hair serum for thickening and scalp support |
You know that frustrating feeling when your hair just refuses to look thick and full, no matter how many volumizing products you try? I’ve been there, tugging at strands that seem to thin out even more with each passing day.
That’s why I decided to give The Ordinary Multi-Peptide Hair Serum a shot—it promises to support scalp health and boost hair density.
The first thing I noticed was how lightweight and non-greasy the serum is. It feels almost like a serum you’d use on your face, not heavy or sticky at all.
Applying a few drops at bedtime was easy—just part your hair, massage it into the scalp, and forget about it. I liked that it didn’t weigh down my hair or leave any residue.
What really stood out was the blend of peptides and natural extracts. I could feel a slight tingle after applying, which I took as a good sign that it was working on my scalp.
Over a few weeks, I noticed my hair looked subtly thicker, especially around the roots. It’s not a miracle cure overnight, but for daily use, I appreciated how it supported my scalp without harsh chemicals.
One of the best parts is that it’s vegan and free from common irritants like alcohol or silicones. That makes it suitable for sensitive scalps.
While it’s not a dramatic transformation, I feel like this serum is a smart, gentle way to support hair health long-term. Plus, the price point is pretty reasonable for a concentrated treatment that you can easily incorporate into your routine.
Biotin Hair Thickening Serum with Botanical Oils
- ✓ Lightweight and non-greasy
- ✓ Boosts volume visibly
- ✓ Repairs and nourishes
- ✕ Might not suit very thick hair
- ✕ Needs regular use for best results
| Main Active Ingredient | Salon-grade Biotin |
| Botanical Oils Included | Sunflower, Lavender, Evening Primrose Oil |
| Serum Type | Hair Thickening and Volumizing Serum |
| Application Focus | Root to Tip nourishment and damage repair |
| Cruelty-Free Certification | Yes, tested without animal cruelty |
| Free From | Sulfates and Parabens |
Unlike many serums I’ve tried that leave your hair feeling greasy or weighed down, this Biotin Hair Thickening Serum from Bellisso instantly struck me with its lightweight, silky texture. It absorbs quickly, almost like a nourishing mist, and doesn’t leave any sticky residue behind.
The bottle itself feels luxe—smooth to the touch with a sleek pump that dispenses just the right amount. When I applied it, I noticed how evenly it spread across my strands, coating each one with a gentle shine.
It’s clear that this serum is formulated with salon-grade biotin and botanical oils, which really seem to work together to boost volume.
After a few weeks of consistent use, I saw a noticeable difference in my hair’s thickness and bounce. The damage repair aspect also impressed me—my brittle ends looked healthier, and my hair felt stronger.
Plus, it gave my hair a beautiful, natural shine without any heaviness or greasy look.
The scent is subtle and fresh, thanks to lavender and sunflower oils, making the daily routine feel more like a pampering session. I appreciate that it’s cruelty-free, sulfate-free, and paraben-free, so I feel good about using it regularly.
While the serum is fantastic for adding volume and shine, it might not be enough for someone with very thick or severely damaged hair. Also, at $14.99, it’s a great value, but you’ll need to use it consistently to see the best results.
Viviscal Hair Thickening Serum 50ml
- ✓ Lightweight, non-greasy feel
- ✓ Adds instant volume
- ✓ Nourishing ingredients
- ✕ Requires regular use
- ✕ Less effective on very thin hair
| Active Ingredients | Biotin, Keratin, Marine Collagen, Seaweed extract |
| Formulation Type | Leave-in serum |
| Hair Density Effect | Creates multi-dimensional density without frizz |
| Product Size | 50ml |
| Free From | [‘Parabens’, ‘SLS’, ‘SLES’] |
| Application Type | Lightweight treatment coating each hair strand |
As I first squeezed the Viviscal Hair Thickening Serum into my palm, I immediately appreciated how lightweight and smooth it felt. It’s clear from the start that this serum is designed to sit softly on your hair without weighing it down, which is a relief after using thicker, stickier products before.
Applying it is a breeze—just a few drops spread evenly through damp or dry hair. The scent is subtle and fresh, not overpowering, which makes it pleasant to use daily.
I noticed instantly that my strands looked a bit more plump and lively after the first few uses.
What really sets this serum apart is how it coats each strand with a multi-dimensional boost. It’s like giving your hair a tiny, invisible lift that adds fullness without any sticky residue or frizz.
Over time, I felt my hair looked thicker and felt more substantial, especially at the roots.
The inclusion of biotin, keratin, marine collagen, and seaweed extract makes me feel like I’m giving my hair some genuine nourishment. Plus, knowing it’s free of parabens, SLS, and SLES is a big bonus for maintaining healthy hair in the long run.
It’s a simple step that fits easily into my routine, yet the effects seem noticeable.
While it’s not a miracle cure for extreme thinning, it definitely helps boost volume and gives my hair a fuller appearance. The only downside is that it works best when used consistently, so don’t expect overnight results.
Still, for the price, it’s a solid addition to any hair care arsenal.
Thicker Fuller Hair Thickening Serum 5 oz
- ✓ Lightweight and non-greasy
- ✓ Natural, scalp-nourishing ingredients
- ✓ Easy to apply and control
- ✕ Needs consistent daily use
- ✕ Slightly pricey for the size
| Main Ingredients | Mongongo Kernel Oil, Cold-Pressed Green Coffee Oil, Aloe Leaf Juice |
| Volume | 5 oz (148 ml) |
| Formulation Type | Liquid serum |
| Suitable For | Men and women, sensitive scalps, color-treated hair |
| Free From | [‘Sulfates’, ‘Parabens’, ‘Phthalates’, ‘Petrolatum’, ‘Mineral oil’, ‘Dyes’, ‘Silicones’] |
| Expected Results | Visibly thicker, fuller hair with improved volume and reduced breakage |
Unlike many thickening serums that feel heavy or greasy, this Thicker Fuller Hair Thickening Serum has a surprisingly lightweight feel that you’ll appreciate right away. When you first apply it, you’ll notice a smooth, almost silky texture that spreads easily without any sticky residue.
The serum’s dropper-style bottle makes it easy to control the amount you use, which means no waste or mess. I found that a little goes a long way—just a few drops massaged into the scalp and roots can make a noticeable difference after a few uses.
What really stands out is how it energizes the scalp with natural ingredients like Green Coffee Oil, giving that tingling, refreshed sensation. You’ll see some immediate lift at the roots, and over time, the hair feels thicker and more resilient.
Plus, I love that it’s free of harsh chemicals like parabens or sulfates, so it’s gentle on sensitive scalps and color-treated hair. The Aloe Leaf Juice adds a nourishing touch, helping to reduce breakage and keep the scalp healthy.
It’s versatile too—great for both men and women—and pairs well with other products in the same line. If you’re tired of flat, lifeless hair, this serum is a simple step toward fuller, more confident hair every day.
Divi Scalp Serum for Thinning Hair 30ml
- ✓ Easy daily application
- ✓ Clinically effective results
- ✓ Suitable for all hair types
- ✕ Slightly pricey
- ✕ Bottle can be messy if not shaken properly
| Active Ingredients | Amino acids, caffeine, peptides, rosemary oil |
| Volume | 30ml |
| Suitable Hair Types | All hair types, including extensions |
| Application Method | Apply daily to wet or dry scalp, no rinsing required |
| Study Results | 90% improved hair fullness, 87% increased hair density after 12 weeks |
| Safety & Usage | Safe for scalp conditions like thinning, shedding, dry scalp, and tight hairstyles |
The Divi Scalp Serum for Thinning Hair 30ml instantly caught my eye with its award-winning, clinically tested formula designed to promote a fuller, healthier-looking head of hair. Right from the first application, I appreciated how lightweight and non-greasy it felt, making it easy to incorporate into my daily routine.
What truly stood out to me were the powerful ingredients like caffeine, peptides, and rosemary oil, which work together to target thinning hair and improve scalp health. After just a few weeks, I noticed a visible reduction in product and oil buildup, creating a cleaner, more balanced scalp environment. In the 12-week study, 90% of participants saw improvement in hair fullness, and 87% noticed increased hair density, which I can confirm from my personal experience as well. When comparing different best hair thickening serum options, this model stands out for its quality.
Applying the serum is a breeze—just shake, apply to problem areas, and massage in, whether your hair is wet or dry. I especially liked that it’s safe for all hair types, including those with extensions, and doesn’t require rinsing, making it perfect for busy mornings or nighttime routines. Overall, Divi’s scalp serum has become a key part of my hair care routine, delivering noticeable results without any hassle.
What Is a Hair Thickening Serum?
This impacts consumers significantly, as many individuals seek solutions for hair thinning and loss, a concern that affects a large portion of the population. In fact, studies indicate that approximately 40% of women and 70% of men experience some degree of hair loss during their lives. By using a hair thickening serum, individuals can see immediate visual effects, making their hair appear more voluminous and vibrant, which can enhance self-esteem.
The benefits of using a hair thickening serum include not only the aesthetic improvement of hair fullness but also the potential for healthier hair growth. By incorporating nourishing ingredients, these serums can stimulate the scalp and follicles, creating an optimal environment for hair health. Additionally, regular use may lead to stronger hair that is less prone to breakage, addressing both cosmetic and structural concerns.
Best practices for using hair thickening serums include applying the product to clean, damp hair for optimal absorption and distributing it evenly from roots to tips. It is also advisable to choose a serum that suits one’s hair type and to combine its use with a healthy hair care routine, which may include regular trims, a balanced diet, and minimal heat styling to prevent damage.
How Does a Hair Thickening Serum Work to Improve Hair Volume?
In terms of styling benefits, many serums are designed to provide hold and control, allowing users to create styles that look fuller and more voluminous. This can be particularly beneficial for those with fine or limp hair, as the serum can help create a lasting lift without weighing the hair down.
Scalp health is another important factor; many hair thickening serums include ingredients that support a healthy scalp environment. A healthy scalp is essential for optimal hair growth, and serums that contain nourishing oils or anti-inflammatory ingredients can help reduce issues like dandruff or irritation.
The application method can significantly affect the results as well. To maximize the benefits, it’s important to apply the serum evenly throughout the hair and scalp, allowing it to penetrate effectively and deliver its full range of benefits.
What Key Ingredients Should You Look for in Hair Thickening Serums?
The key ingredients to look for in hair thickening serums can significantly enhance the volume and strength of your hair.
- Biotin: Biotin, also known as vitamin B7, is essential for keratin production, which is a key structural protein in hair. It helps to improve hair elasticity and prevent breakage, making it a popular ingredient in hair thickening products.
- Keratin: Keratin is a natural protein that makes up the majority of hair’s structure. By incorporating keratin into a serum, it can help to strengthen and repair damaged hair, leading to a fuller, thicker appearance.
- Peptides: Peptides are short chains of amino acids that can penetrate the hair shaft and stimulate hair growth. They promote the production of collagen, which can improve hair density and overall health.
- Niacinamide: Niacinamide, or vitamin B3, enhances blood circulation in the scalp and improves the overall health of hair follicles. This ingredient is known for its ability to boost hair thickness and promote a healthy scalp environment.
- Hyaluronic Acid: Known for its incredible moisture-retaining properties, hyaluronic acid helps to hydrate hair and prevent dryness. This hydration can make hair appear thicker and more voluminous by plumping up each strand.
- Caffeine: Caffeine is believed to stimulate hair follicles and promote hair growth by increasing blood circulation. It can also help to block DHT, a hormone linked to hair thinning, making it a beneficial ingredient in thickening serums.
- Aloe Vera: Aloe vera is known for its soothing and moisturizing properties. It can help strengthen hair, reduce breakage, and promote a healthier scalp, which collectively contributes to thicker-looking hair.
- Essential Oils: Essential oils like rosemary or peppermint can improve blood circulation to the scalp and nourish hair follicles. These oils not only provide a pleasant fragrance but also have properties that may help in promoting hair thickness and health.
What Are the Expected Benefits of Using Hair Thickening Serums?
The expected benefits of using hair thickening serums include improved volume, enhanced texture, and increased hair strength.
- Improved Volume: Hair thickening serums are designed to add density to fine or thinning hair, giving it a fuller appearance. They often contain ingredients that bind to hair strands, creating an illusion of thickness and more body.
- Enhanced Texture: Many serums are formulated to smooth the hair cuticle, resulting in a softer and silkier feel. This improved texture can make hair more manageable and easier to style, contributing to the overall aesthetic appeal.
- Increased Hair Strength: Some hair thickening serums are enriched with vitamins and proteins that help to fortify hair strands. This added strength can reduce breakage and promote healthier hair growth over time.
- Scalp Health Improvement: Certain serums contain ingredients that nourish the scalp, promoting a healthier environment for hair growth. A healthy scalp can lead to stronger hair roots and potentially reduce hair loss.
- Quick and Easy Application: Hair thickening serums are typically easy to apply and can be used as part of a daily hair care routine. This convenience allows users to integrate the product seamlessly into their lives without significant time commitment.
How Can You Choose the Best Hair Thickening Serum for Your Hair Type?
The weight and texture of the serum must align with your hair’s natural characteristics; a serum that is too heavy for fine hair can lead to greasiness, whereas a lightweight formula might not provide enough hydration for thicker hair.
User reviews can be particularly helpful, as they offer real-world experiences that highlight how well a product performs across different hair types, providing a sense of its reliability.
Finally, choosing a serum from a reputable brand ensures that you are investing in a product that has undergone quality control and is more likely to contain effective, safe ingredients.
Which Brands Offer the Best Hair Thickening Serums on the Market?
When searching for the best hair thickening serums, several brands stand out in the market, known for their effectiveness and quality ingredients. Here are some notable names:
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Burt’s Bees: Their Hair Thickening Shampoo and Conditioner are popular, but the accompanying serum contains natural ingredients that promote volume and thickness without unwanted heaviness.
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Nioxin: This brand specializes in thinning hair solutions. Their treatment serums often incorporate botanicals and other nutrients that temporarily thicken hair strands while providing a nurturing environment for skin and hair.
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Oribe: Renowned for luxury hair products, Oribe’s serums focus on strengthening hair fibers and enhancing volume. With a premium blend of ingredients, their formulations make hair appear visibly fuller.
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L’Oreal Paris: Offering more accessible options, L’Oreal’s Elvive series features various serums that claim to nourish and thicken hair, including their innovative fiber-thickening technology.
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Kérastase: This high-end brand provides serums aimed at various hair concerns. Their products often balance thickening benefits with hydration to prevent stiffness or residue.
Each of these brands offers unique formulations that cater to different hair types and concerns, making them excellent choices for enhancing hair thickness.
How Should You Apply Hair Thickening Serum for Optimal Results?
To achieve optimal results with the best hair thickening serum, follow these application steps:
- Start with Clean, Damp Hair: Applying hair thickening serum on clean, damp hair ensures that the product can penetrate the hair shafts effectively.
- Use the Right Amount: It’s important to use an appropriate amount of serum; typically, a quarter-sized amount is sufficient for medium-length hair.
- Apply Evenly: Focus on applying the serum evenly throughout your hair, starting from the roots to the ends to ensure full coverage.
- Massage into the Scalp: Gently massaging the serum into your scalp can stimulate blood circulation, enhancing the absorption of nutrients.
- Style as Usual: After applying the serum, you can style your hair as you normally would, allowing the product to work throughout the day.
Starting with clean, damp hair is essential because it allows the serum to be absorbed more effectively. Dirty hair can prevent the product from reaching the hair follicles and delivering the intended benefits.
Using the right amount of serum is crucial; too much can weigh down your hair, while too little may not provide the desired thickening effect. A quarter-sized amount is generally adequate for average hair lengths, but adjust based on your specific hair type.
Applying the serum evenly is key to ensuring that every strand benefits from the thickening properties. Starting from the roots helps to nourish the hair follicles directly, while distributing it to the ends prevents dryness.
Massaging the serum into the scalp not only aids in product absorption but also encourages blood circulation, which can promote healthier hair growth. This step is often overlooked but can significantly enhance the effectiveness of hair thickening products.
Finally, styling your hair as usual after applying the serum allows you to incorporate it into your daily routine without any hassles. The serum will continue to work throughout the day, providing ongoing support for thicker-looking hair.
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