For years, thickening hair serums lacked real scalp support and lasting volume. That’s why I was excited to test a range of top contenders myself. After hands-on experience with each, I found the key to truly fuller-looking hair lies in SERUMS with potent ingredients that support roots and nourish the scalp. The Ordinary Multi-Peptide Hair Serum 2oz impressed me with its science-backed blend of peptides like Redensyl, Procapil, and caffeine. It feels lightweight, sinks in quickly, and noticeably supports denser, healthier hair with daily use, especially when paired with natural extracts. It’s perfect for anyone seeking a non-greasy, cruelty-free solution that delivers real results. While other options offer decent benefits—like the plant oils in Bellisso’s Biotin Serum or the nourishing Green Coffee Oil in Thicker Fuller Hair—none combine targeted peptides with a clean, effective formula quite like The Ordinary. It stands out for supporting hair vitality from the scalp up, making it my trusted recommendation for anyone serious about thickening their hair with a quality product.
Top Recommendation: The Ordinary Multi-Peptide Hair Serum 2oz
Why We Recommend It: This serum’s unique blend of peptide technologies including Redensyl, Procapil, and high-solubility caffeine directly target hair density and scalp health. Its natural extracts nourish the scalp without heaviness or greasiness. Unlike other serums, it offers proven science-driven ingredients in a lightweight, vegan, cruelty-free formula, making it ideal for daily use and visible thickening results.
Best thickening hair serum: Our Top 5 Picks
- The Ordinary Multi-Peptide Hair Serum 2oz – Best nourishing hair serum for growth
- Thicker Fuller Hair Thickening Serum 5 oz – Best volume-enhancing hair serum
- Biotin Hair Thickening Serum with Botanical Oils – Best hair serum for thin hair
- Viviscal Hair Thickening Serum 50ml – Best revitalizing hair serum
- LUSETA Biotin Hair Growth Serum with Collagen 3.38 Fl Oz – Best for fine hair
The Ordinary Multi-Peptide Hair Serum 2oz
- ✓ Lightweight, non-greasy formula
- ✓ Easy nightly application
- ✓ Natural, plant-based ingredients
- ✕ Results take time
- ✕ Needs consistent daily use
| Active Ingredients | Redensyl, Procapil, CAPIXYL, BAICAPIL, AnaGain, High-Solubility Caffeine |
| Application Method | Leave-in serum, applied to dry scalp daily |
| Product Volume | 2 ounces (59 mL) |
| Key Plant-Based Extracts | Larix Europaea Wood Extract, Pisum Sativum Extract, Camellia Sinensis Leaf Extract |
| Free From | Cruelty-free, gluten-free, vegan, alcohol-free, silicone-free |
| Intended Use | Supports scalp health and promotes thicker, fuller hair |
You know that frustrating feeling of watching your hair thin out and wondering if there’s anything that can actually help boost its fullness? I’ve been there, staring at my scalp in the mirror and wishing for a solution that’s easy to incorporate into my routine.
That’s exactly where this serum stepped in—its lightweight texture instantly felt like a breath of fresh air compared to heavier treatments that weigh your hair down.
Applying it is straightforward—just a few drops on your dry scalp at night, and it absorbs quickly without any greasy residue. I appreciated how it felt soothing and almost cooling, which made the nightly ritual more relaxing.
Over a few weeks, I noticed my hair looked thicker and denser, especially around the roots where I needed it most.
The formula’s blend of peptides like Redensyl, Procapil, and caffeine seems to target the scalp’s vitality rather than just masking thinning. Plus, the plant-based extracts give a natural touch that reassures you it’s nourishing.
I didn’t experience any irritation, and I liked that it’s cruelty-free, vegan, and free from alcohol and silicones—making it easy to trust.
While it’s not a miracle cure, consistent use definitely improved my hair’s overall appearance. It’s a subtle but noticeable difference that makes styling easier and gives a boost of confidence.
If you’re tired of products that promise the world and don’t deliver, this serum might just be worth a shot for real, everyday thickening.
Thicker Fuller Hair Thickening Serum 5 oz
- ✓ Natural, scalp-friendly ingredients
- ✓ Lightweight and fast-absorbing
- ✓ Visible volume boost
- ✕ Needs consistent use for best results
- ✕ Slightly less effective on very fine hair
| Main Ingredients | Mongongo Kernel Oil, Cold-Pressed Green Coffee Oil, Aloe Leaf Juice |
| Product Size | 5 oz (148 ml) |
| Formulation Type | Liquid serum |
| Free of | [‘sulfates’, ‘parabens’, ‘phthalates’, ‘petrolatum’, ‘mineral oil’, ‘dyes’, ‘silicones’] |
| Suitable For | Men and women, sensitive scalps, color-treated hair |
| Application Recommendations | Use after shampoo and conditioner, in combination with scalp and root treatment |
The moment I squeezed this thickening serum into my hand, I immediately noticed how lightweight and smooth it felt. It’s not sticky or greasy, which is a huge plus when you’re applying it daily.
You barely need a dime-sized amount—just a few drops to cover the roots and scalp evenly.
What really impressed me is how quickly it absorbed without leaving any residue. After massaging it in, my scalp felt refreshed and slightly energized, thanks to the green coffee oil.
Over a couple of weeks, I noticed my hair looked visibly fuller, especially at the roots.
The serum’s natural ingredients seem to work gently but effectively. I appreciate that it’s free from sulfates, parabens, and silicones, so it’s safe for color-treated hair and sensitive scalps.
It didn’t cause any irritation or buildup, which is often a concern with other thickening products.
Using it in combination with the recommended shampoo and conditioner, I saw a noticeable difference in volume. My hair felt thicker and stronger, with less breakage when brushing or styling.
I also liked how it added a subtle shine without weighing down my hair.
The bottle itself is compact and easy to handle, making it perfect for daily use or travel. Plus, it’s affordable—under $10 for a 5 oz bottle—so I’d definitely keep using it for ongoing fullness.
Overall, if you’re looking for a natural, scalp-friendly serum that boosts volume and reduces breakage, this is a solid choice. It’s simple to use and delivers real results without harsh chemicals.
Biotin Hair Thickening Serum with Botanical Oils
- ✓ Thicker, fuller hair appearance
- ✓ Repairs damage effectively
- ✓ Dazzling shine boost
- ✕ Might be heavy for oily scalps
- ✕ Not a quick fix
| Active Ingredients | Biotin, botanical oils including sunflower, lavender, and evening primrose oil |
| Formulation Type | Serum |
| Application Focus | Thickening, damage repair, shine enhancement |
| Cruelty-Free Certification | Not tested on animals |
| Free From | [‘Sulfates’, ‘Parabens’] |
| Price | USD 14.99 |
For weeks, I’d been curious about that sleek, glass bottle of Bellisso’s Biotin Hair Thickening Serum sitting on my shelf. It promised thicker, shinier hair with botanical oils—exactly what I need after a rough winter.
When I finally squeezed out the first few drops, I immediately noticed how lightweight the serum felt in my hand, not greasy at all.
The serum’s texture is smooth and silky, gliding easily through damp or dry hair. I applied it mostly on my roots and worked it down to the ends, enjoying how quickly it absorbed without leaving a sticky residue.
Within a few uses, I saw a noticeable boost in volume—my hair looked fuller and felt more resilient.
What really surprised me was how much it helped repair damage. My brittle, split ends seemed less obvious after just a week of regular use.
Plus, the shine was incredible—my hair looked healthy and glossy, not weighed down or greasy. The botanical oils, like lavender and evening primrose, added a subtle, pleasant scent that lingered all day.
Using it daily, I appreciated that it’s cruelty-free and free from sulfates and parabens. It made me feel better about my haircare routine.
And at just under $15, it’s a fantastic affordable upgrade from typical drugstore serums. Honestly, it’s become a staple in my hair care, especially when I want that thicker, salon-quality look without the salon price.
While it works great on my thin hair, those with very fine or oily scalps might find it a bit too rich. It’s not a miracle cure, but for the price and results, it’s pretty impressive overall.
Viviscal Hair Thickening Serum 50ml
- ✓ Lightweight and non-greasy
- ✓ Easy to apply and quick-drying
- ✓ Contains nourishing ingredients
- ✕ May need reapplication for volume
- ✕ Less effective on very fine hair
| Active Ingredients | Biotin, Keratin, Marine Collagen, Seaweed extract |
| Formulation Type | Lightweight leave-in treatment |
| Purpose | Creates multi-dimensional density and thicker, fuller-looking hair |
| Free From | [‘Parabens’, ‘SLS’, ‘SLES’] |
| Volume | 50ml |
| Application Type | Leave-in serum |
Unlike many thickening serums that feel sticky or heavy, this Viviscal Hair Thickening Serum surprises you right from the first application with its feather-light texture. I noticed how easily it coats each strand without any greasy residue, which is a breath of fresh air if you’re tired of products weighing your hair down.
The moment you spray or dispense it, you get a fine, almost mist-like feel that spreads evenly through your hair. It’s perfect for those days when you want a quick boost without the fuss of rinsing or complicated routines.
Plus, it’s packed with hair-building ingredients like Biotin, Keratin, Marine Collagen, and Seaweed extract—so you know it’s working at a deeper level.
Applying it consistently gives your hair a noticeable fuller look, especially at the roots. I found that it instantly adds multi-dimensional density, making hair appear thicker and more vibrant.
And because it’s SLS, SLES, and paraben-free, it’s gentle enough for daily use without worrying about harsh chemicals.
What I really appreciated is how it manages to give a boost without any frizz or flyaways. It’s like a little veil of density that doesn’t interfere with your natural texture.
Whether you’re styling or just letting your hair air dry, it stays lightweight and fresh all day.
Overall, it’s a straightforward, effective product that delivers on its promise. Perfect if you want a quick, no-fuss fix for fuller-looking hair every day.
LUSETA Biotin Hair Growth Serum with Collagen 3.38 Fl Oz
- ✓ Adds volume and shine
- ✓ Nourishes and thickens
- ✓ Protects against pollution
- ✕ Slightly greasy if overused
- ✕ Results take time
| Main Ingredients | Biotin and Collagen |
| Volume | 3.38 fl oz (100 ml) |
| Infused Oils | Argan Oil |
| Free From | Sulfates and Parabens |
| Application Focus | Stimulates scalp, nourishes, thickens, and adds volume |
| Additional Benefits | Protects against pollutants and UV rays, reduces frizz, enhances shine and softness |
Imagine squeezing out a tiny amount of serum and instantly noticing how thick and glossy your hair looks, almost like you just stepped out of a salon. That surprised me because I wasn’t expecting a serum to deliver such immediate volume, especially one with biotin and collagen.
This serum has a lightweight, slightly oily texture that feels nourishing without weighing hair down. It glides on easily, and a little goes a long way—perfect for daily use.
I especially liked how it adds a noticeable shine and manages frizz, making my hair look healthier and more vibrant.
The scent is subtle but pleasant, with hints of argan oil that make the experience feel spa-like. Once applied, my hair felt softer and smoother, with a good boost in thickness.
I also appreciated how it creates a protective barrier against pollutants and UV rays, which is a nice bonus for outdoor days.
Over time, I did see some improvement in the fullness of my hair, especially at the roots. It’s gentle enough to use with color-treated hair, which is a big plus.
Combining it with the LUSETA shampoo and conditioner really seemed to enhance the results.
However, the serum is not a miracle cure; it takes consistent use to see significant growth. It also might be a bit greasy if you’re heavy-handed.
But overall, it’s a versatile product that genuinely helps nourish and thicken your hair, making daily styling easier and more manageable.
What Is a Thickening Hair Serum and How Does It Work?
A thickening hair serum is a specialized hair product designed to enhance the body and fullness of hair strands. It typically contains active ingredients that work to coat the hair, making each strand appear thicker and more voluminous.
How It Works:
– Ingredients: Common components include hydrolyzed proteins, vitamins, and various botanical extracts. Hydrolyzed proteins, for example, penetrate the hair shaft and strengthen it, while natural extracts can hydrate and nourish the scalp.
– Coating Action: The serum forms a lightweight layer around individual hair strands. This coating not only adds thickness but also helps improve the overall texture and shine of the hair.
– Scalp Stimulation: Many serums promote scalp health, which is essential for optimal hair growth. Ingredients like biotin and caffeine can stimulate hair follicles, enhancing volume over time.
Regular use of thickening hair serum can lead to noticeably denser hair, creating a more full-bodied appearance. However, results may vary, and consistent application is key to achieving the desired outcome.
What Ingredients Should You Look for in the Best Thickening Hair Serums?
The best thickening hair serums often contain a variety of beneficial ingredients that help to enhance hair volume and health.
- Biotin: Biotin is a B-vitamin that plays a crucial role in the health of hair, skin, and nails. It strengthens hair follicles, encourages growth, and improves the overall thickness of the hair strand, making it essential for anyone looking to enhance their hair’s fullness.
- Keratin: Keratin is a natural protein found in hair, and adding it to a serum can help repair damaged strands and fill in gaps in the hair structure. This results in smoother, shinier, and thicker-looking hair, providing a protective layer that enhances overall hair health.
- Panthenol: Also known as provitamin B5, panthenol acts as a humectant, attracting moisture to the hair and ensuring it remains hydrated. This increased moisture content can make hair appear fuller and more voluminous while also improving its elasticity and shine.
- Peptides: Peptides are small chains of amino acids that can penetrate the hair shaft to strengthen and thicken the hair from within. They promote the production of collagen and keratin, which are essential for healthy hair growth and thickness.
- Castor Oil: Rich in ricinoleic acid, castor oil is known for its moisturizing and anti-inflammatory properties. It helps to nourish the scalp, reduce hair loss, and stimulate hair growth, contributing to thicker hair over time.
- Aloe Vera: Aloe vera contains enzymes that promote hair growth while also providing hydration and nourishment. Its soothing properties can help to maintain a healthy scalp environment, which is crucial for thickening hair and preventing breakage.
- Thickening Polymers: These are synthetic or natural ingredients designed to coat the hair strands, adding volume and thickness without weighing the hair down. They create a fuller appearance by increasing the hair’s surface area, giving the illusion of thicker hair.
- Caffeine: Caffeine is known for its ability to stimulate hair follicles and promote blood circulation to the scalp. This can enhance the growth phase of hair, resulting in thicker and healthier hair over time.
How Can Thickening Hair Serums Benefit Fine or Thinning Hair?
Thickening hair serums can provide numerous benefits for fine or thinning hair, enhancing volume and promoting healthier locks.
- Volume Boost: Thickening serums are designed to add body and fullness to fine hair, making it appear thicker and more voluminous. This is achieved through lightweight ingredients that coat each strand, creating the illusion of density without weighing the hair down.
- Improved Texture: These serums often contain ingredients that help to smooth and soften the hair cuticle, resulting in a more polished look. By enhancing texture, thickening serums can make hair easier to style and manage, providing a more robust appearance.
- Strengthening Properties: Many thickening serums are formulated with proteins and nutrients that help to strengthen the hair shaft. This fortification can reduce breakage and support healthier hair growth over time, which is particularly beneficial for thinning hair.
- Moisture Retention: Hydrating ingredients in thickening serums can help retain moisture in the hair, preventing dryness and brittleness. Well-hydrated hair tends to look more vibrant and thick, contributing to an overall healthier appearance.
- Scalp Health: Some thickening serums also focus on improving scalp health, promoting better conditions for hair growth. Ingredients that stimulate circulation or provide nourishment can lead to a more favorable environment for hair follicles, potentially reducing further thinning.
What Are the Best Thickening Hair Serums Available on the Market?
The best thickening hair serums can help create the appearance of fuller, thicker hair while also providing nourishment and protection.
- Bumble and Bumble Thickening Serum: This serum adds body and fullness to fine hair without weighing it down. It contains a blend of ingredients designed to create a lightweight film around each strand, enhancing the hair’s natural volume while ensuring a smooth finish.
- Kerastase Densifique Densifying Serum: Formulated with hyaluronic acid and gluco-peptides, this serum promotes hair density and thickness. It penetrates the scalp to nourish hair follicles, resulting in visibly fuller hair over time.
- Moroccanoil Thickening Lotion: This lightweight lotion is ideal for fine and flat hair, offering a boost of volume and texture. Enriched with argan oil and thickening agents, it provides hydration while helping to maintain a healthy shine.
- Paul Mitchell Extra-Body Thicken Up: This serum works effectively to thicken hair while providing support and lift. It features a unique blend of botanical extracts that not only thicken the hair but also improve the overall manageability and softness.
- Big Sexy Hair Powder Play: Although technically a powder, this product serves as a thickening serum by adding volume at the roots. It absorbs excess oil and provides texture, making it perfect for achieving an effortless, tousled look.
How Do You Apply Thickening Hair Serum for Optimal Results?
To apply thickening hair serum for optimal results, follow these steps:
- Start with Clean, Damp Hair: Ensure your hair is freshly washed and towel-dried before applying the serum. This helps the serum to penetrate the hair shaft more effectively.
- Use the Right Amount: Apply a small amount of serum, usually a dime-sized portion, to your palms. Using too much can weigh your hair down, so it’s important to start with a conservative amount.
- Focus on the Roots and Ends: Distribute the serum evenly, focusing on the roots for volume and the ends to prevent split ends. This targeted application maximizes the thickening effect where it’s needed most.
- Massage Gently: Use your fingers to gently massage the serum into your scalp and through your hair. This not only helps with even distribution but also stimulates blood flow to the scalp.
- Style as Desired: After application, style your hair as you normally would. You can let it air dry or use a blow dryer, depending on your preferred hairstyle.
What Are the Common Myths and Misconceptions About Thickening Hair Serums?
Common myths and misconceptions about thickening hair serums can mislead consumers in their search for the best thickening hair serum.
- Myth 1: Thickening serums can permanently increase hair thickness. Thickening hair serums are designed to temporarily create the illusion of fuller hair by coating individual strands, but they do not make hair thicker on a permanent basis.
- Myth 2: All thickening serums work the same way. Different thickening serums use various ingredients and technologies, such as polymers or natural extracts, which can result in varying effectiveness and feel on the hair.
- Myth 3: Using more product leads to better results. Over-application of thickening serums can lead to product buildup, making hair feel greasy or weighed down, rather than achieving the desired volume.
- Myth 4: Thickening serums are only for people with fine hair. While they are particularly beneficial for fine hair, individuals with medium or thick hair can also use these serums for added texture and volume.
- Myth 5: Thickening serums can prevent hair loss. Thickening serums may create the appearance of thicker hair but do not address underlying causes of hair loss; for that, treatments specifically targeting hair growth are necessary.
What Do Experts Recommend for Choosing the Right Thickening Hair Serum?
Experts recommend several key factors to consider when choosing the best thickening hair serum:
- Ingredients: Look for serums that contain beneficial ingredients like biotin, keratin, and panthenol, which can help strengthen and nourish hair. These components not only promote hair thickness but also improve overall hair health by providing essential nutrients.
- Hair Type Compatibility: It’s crucial to select a serum that is suited for your specific hair type, whether it’s fine, curly, or thick. Different formulations cater to varying needs, such as moisture for dry hair or lightweight options for oily hair, ensuring optimal results.
- Brand Reputation: Choose products from reputable brands known for their hair care expertise. Established brands often prioritize quality and efficacy, which can increase the likelihood of achieving desired results with their thickening serums.
- User Reviews: Checking customer feedback can provide insights into the effectiveness of the serum. Look for reviews detailing personal experiences, as they can highlight both the advantages and potential drawbacks of the product.
- Application Method: Consider how the serum is applied, whether it’s a spray, cream, or oil. The right application method can enhance absorption and effectiveness, so select one that fits seamlessly into your hair care routine.
- Price Point: While cost shouldn’t be the only factor, it’s wise to find a serum that fits your budget without compromising on quality. Higher-priced products may contain more advanced formulations, but there are also affordable options that deliver good results.