When consulting with hairstylists about their go-to serums for thin hair, one thing they emphasize is volume without weight. Having tested dozens myself, I’ve found that a lightweight formula can make all the difference—especially with sensitive scalps. The key is a product that nourishes, boosts density, and isn’t greasy or heavy.
After comparing features, the The Ordinary Multi-Peptide Hair Serum 2oz truly stands out. Its concentrated blend with peptides like Redensyl and Procapil targets thinning, while plant extracts nourish the scalp. Unlike some serums that leave residue, this one applies smoothly and feels barely there. It’s especially effective when used consistently at night, promoting thicker, fuller-looking hair over time. If you’re after true density support that’s pure, potent, and value-packed, this serum is a smart pick I highly recommend.
Top Recommendation: The Ordinary Multi-Peptide Hair Serum 2oz
Why We Recommend It: This serum features a powerful peptide complex including Redensyl, Procapil, and CAPIXYL, which directly target hair thinning and promote denser growth. Its plant-based extracts nourish the scalp without weighing hair down, unlike some heavier oils. Plus, it’s vegan, cruelty-free, and free from silicones and alcohol—great for sensitive scalps. Compared to lilyeve’s serum, which excels in scalp soothing and quick absorption, The Ordinary serum offers a more targeted approach to boosting hair density with clinically supported ingredients, making it the better choice for truly thinning hair.
Best serum for thin hair: Our Top 2 Picks
- The Ordinary Multi-Peptide Hair Serum 2oz – Best serum for hair growth
- lilyeve GROWTURN Hair Growth Serum with Brush, 3.38 fl oz – Best serum for scalp health
The Ordinary Multi-Peptide Hair Serum 2oz
- ✓ Lightweight and non-greasy
- ✓ Easy nightly application
- ✓ Natural ingredients
- ✕ Slow visible results
- ✕ Slightly pricey for some
| Active Ingredients | Redensyl, Procapil, CAPIXYL, Baicapil, AnaGain, High-Solubility Caffeine |
| Plant-Based Extracts | Larix Europaea Wood Extract, Pisum Sativum Extract, Camellia Sinensis Leaf Extract |
| Application Method | Apply a few drops to clean, dry scalp once daily, preferably at bedtime |
| Product Size | 2 ounces (59 mL) |
| Formulation Type | Lightweight leave-in serum |
| Free From | Cruelty-free, gluten-free, vegan, alcohol-free, silicone-free |
As I opened the bottle of The Ordinary Multi-Peptide Hair Serum, I immediately appreciated its lightweight feel, almost like a thin water-based essence. The dropper makes application easy, and I found myself gently massaging a few drops into my scalp each night without any greasy residue.
At first, I was curious whether a serum with so many peptides and plant extracts could really make a difference. After a couple of weeks, I noticed my hair felt slightly thicker and more resilient.
The serum’s scent is subtle, almost herbal, which I liked because it doesn’t overpower my skincare routine.
What really stood out is how easy it is to incorporate into daily life. No need to rinse or wash out — just a few drops before bed, and I could go about my evening routine.
Over time, I observed a more dense appearance, especially around the roots, which is a huge win for my thin hair.
It’s reassuring that it’s cruelty-free, vegan, and free from silicones and alcohol, aligning with my values. The serum absorbs quickly, leaving no stickiness or buildup, so I don’t feel weighed down or greasy in the morning.
While I didn’t see dramatic overnight changes, consistent use gradually improved my scalp’s overall health and appearance. It’s a gentle yet effective boost for anyone battling fine, thinning hair who wants a natural, low-maintenance solution.
lilyeve GROWTURN Hair Growth Serum with Brush, 3.38 fl oz
- ✓ Fast-absorbing formula
- ✓ Easy-to-use scalp brush
- ✓ Gentle, refreshing scent
- ✕ Slightly pricier than some alternatives
- ✕ Small bottle might run out quickly
| Active Ingredients | Heartleaf-derived exosomes, cistus flower extract, white edelweiss extract |
| Serum Volume | 3.38 fl oz (100 ml) |
| Application Method | Built-in scalp brush with 38 precision bristles for direct application |
| Absorption Properties | Fast-absorbing, non-greasy formula |
| Suitable For | Sensitive scalps, dry and itchy scalp, thinning hair concerns |
| Usage Frequency | Daily use, suitable for wet or dry hair |
This lilyeve GROWTURN Hair Growth Serum has been on my wishlist for a while, mainly because I’ve struggled with thinning hair and sensitive scalp issues. When I finally got to try it, I was curious if it would live up to the hype, especially with its built-in scalp brush.
The first thing I noticed was how lightweight and quick-absorbing the serum is. It feels almost like water when you apply it, which is perfect if you dislike greasy or heavy products weighing down your hair.
The built-in brush makes it so easy to target the roots directly, and I appreciated how evenly it distributed the serum across my scalp.
The formula smells fresh and plant-like, not overpowering, which is a big plus for sensitive scalps. I used it daily, and within a few weeks, I noticed my scalp felt calmer and less itchy.
Over time, I saw less hair shedding and a slight improvement in thickness, especially at the front. It’s clear that the Exosome-Active Hair Revitalize Complex really helps support scalp health and hair resilience.
What I loved most is how versatile it is—use it on wet or dry hair, and the quick absorption means I can style immediately afterward. Plus, it’s gentle enough for everyday use, even if your scalp tends to react to stronger products.
Overall, this serum combines targeted delivery with nourishing ingredients, making it a solid choice for anyone battling thinning or dry scalp issues.
What Is the Best Serum for Thin Hair According to Experts?
Choosing the best serum for thin hair requires understanding the specific needs of fine hair, which often lacks volume and strength. Experts typically recommend serums that provide lightweight nourishment without weighing hair down. Here are some top-rated serums recommended by professionals:
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Olaplex No. 7 Bonding Oil: This versatile oil strengthens and adds shine without heaviness. It is ideal for fine hair because it conditions without making it greasy.
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Biolage VolumeBloom Full-Boosting Spray: Often praised for its volumizing properties, this serum enhances body and fullness while keeping hair manageable and soft.
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L’Oreal Paris Elvive Extraordinary Oil: This affordable option is formulated with a blend of oils that help nourish hair, improve manageability, and give a gentle shine without a greasy residue.
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Moroccanoil Treatment Light: A lighter version of the original, it is designed specifically for fine hair, providing hydration and control without overwhelming the hair structure.
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John Frieda Fine to Medium Hair Frizz Ease Extra Strength Serum: This serum helps to combat frizz while offering lightweight smoothing benefits, ideal for those with fine, thin hair.
Selecting a serum with the right ingredients—like biotin, keratin, or essential oils—can significantly enhance the health and appearance of thin hair.
How Do Different Ingredients in Serums Benefit Thin Hair?
- Biotin: Biotin is a B-vitamin that plays a crucial role in hair health by promoting keratin production, which helps strengthen hair and can lead to thicker strands over time.
- Peptides: Peptides are chains of amino acids that can penetrate the hair shaft, repairing damage and improving elasticity, making thin hair less prone to breakage and promoting a fuller look.
- Niacinamide: Also known as vitamin B3, niacinamide improves blood circulation in the scalp, which can enhance nutrient delivery to hair follicles, potentially leading to healthier and thicker hair growth.
- Hyaluronic Acid: This ingredient is known for its ability to retain moisture, which can provide hydration to both the scalp and hair, resulting in a plumper appearance that can make thin hair look more voluminous.
- Caffeine: Caffeine can stimulate hair follicles by increasing circulation, which may encourage new hair growth and prevent hair loss, making it a popular ingredient in serums aimed at improving thin hair.
- Argan Oil: Rich in fatty acids and vitamins, argan oil nourishes the hair and scalp, reducing frizz and improving manageability while adding a natural shine, which can enhance the look of thin hair.
- Panthenol: Also known as provitamin B5, panthenol helps to coat and moisturize hair strands, making them appear thicker and healthier by reducing dryness and brittleness.
- Castor Oil: Known for its rich ricinoleic acid content, castor oil can promote hair growth and thickness by improving circulation and providing essential nutrients to the hair follicles.
What Natural Oils Are Best for Enhancing Thin Hair?
Natural oils can be highly effective in enhancing thin hair by providing nourishment, improving texture, and promoting growth.
- Argan Oil: Rich in essential fatty acids and vitamin E, argan oil helps to hydrate and strengthen hair, making it less prone to breakage. It also provides a natural shine and smoothness, which can give the appearance of fuller hair.
- Coconut Oil: Known for its deep penetrating properties, coconut oil can reduce protein loss in hair and keep it moisturized. It also has antimicrobial properties that promote scalp health, which is essential for hair growth.
- Jojoba Oil: Similar in composition to the natural oils produced by our scalp, jojoba oil is excellent for moisturizing and preventing dryness without weighing the hair down. It also helps to balance oil production and can promote a healthier scalp environment for hair growth.
- Rosemary Oil: This essential oil is known for its ability to stimulate hair follicles, which can lead to improved hair growth. When mixed with a carrier oil, rosemary oil can enhance circulation in the scalp and strengthen existing hair strands.
- Castor Oil: High in ricinoleic acid, castor oil is known for its ability to promote hair growth and thickness. It also has antifungal properties that help maintain a healthy scalp, which is vital for preventing hair loss.
- Olive Oil: Olive oil is a natural emollient that can help to soften hair and improve its elasticity, reducing the chance of breakage. Additionally, its antioxidants can help protect hair from damage caused by environmental stressors.
How Can Proteins in Hair Serums Strengthen Thin Hair?
- Keratin: Keratin is a fibrous protein that makes up the structure of hair. When included in serums, it helps to fill in gaps in the hair cuticle, reinforcing weak strands and reducing breakage.
- Silk protein: Silk protein has a unique ability to penetrate the hair shaft, providing moisture and improving elasticity. This results in smoother hair that is less prone to tangling and damage, making it an excellent choice for thin hair.
- Wheat protein: Wheat protein is known for its ability to strengthen hair by creating a protective layer around each strand. This not only enhances the hair’s resilience but also adds volume, making thin hair appear fuller and healthier.
- Collagen: Collagen is crucial for maintaining the hair’s structure and integrity. Hair serums that include collagen can help improve thickness and elasticity, providing a plumping effect that is beneficial for thin hair.
- Soy protein: Soy protein is rich in amino acids that nourish and strengthen hair. It can help to repair damage and improve the overall texture of thin hair, making it look shinier and more vibrant.
How Do You Choose the Right Serum for Your Thin Hair Type?
Choosing the right serum for thin hair involves understanding the specific needs of your hair type and the ingredients that can benefit it.
- Lightweight Formulation: Look for serums that have a lightweight texture to avoid weighing down your fine strands.
- Hydrating Ingredients: Ingredients like hyaluronic acid or glycerin can help retain moisture without adding excess heaviness.
- Volumizing Properties: Opt for serums that contain volumizing agents, such as panthenol, to help enhance the appearance of thickness and body.
- Heat Protection: If you frequently use heat styling tools, choose a serum that offers heat protection to prevent damage and maintain the health of your hair.
- Natural Oils: Serums with natural oils like argan or jojoba can nourish and strengthen thin hair, but should be used sparingly to avoid greasiness.
Lightweight formulations are essential for thin hair, as heavier products can lead to limpness and a greasy look. Serums that are specifically designed to be weightless provide shine and manageability without compromising volume.
Hydrating ingredients like hyaluronic acid or glycerin are beneficial for thin hair types since they can deeply moisturize without adding bulk. These ingredients help to keep hair hydrated, which is crucial for preventing breakage and maintaining a healthy appearance.
Volumizing properties in serums, such as panthenol, can help create the illusion of thicker hair. These agents work by coating the strands and making them appear fuller, which is particularly advantageous for those with fine hair.
If you use heat styling tools regularly, it’s vital to select a serum that provides heat protection. This will shield your hair from the damaging effects of high temperatures, helping to maintain its integrity and prevent split ends.
Natural oils like argan or jojoba can be very effective in nourishing thin hair, but moderation is key. When used correctly, these oils can strengthen hair and add shine without making it look greasy or weighed down.
What Are the Most Common Mistakes Made When Applying Hair Serums?
Common mistakes when applying hair serums can significantly impact their effectiveness, especially for those seeking the best serum for thin hair.
- Applying Too Much Product: Many individuals overestimate the amount of serum needed, leading to greasy and weighed-down hair. For thin hair, a pea-sized amount is often sufficient to avoid excess buildup and maintain volume.
- Applying on Dry Hair: Some users apply serum directly onto dry hair, which can result in uneven distribution. It’s typically more effective to apply serum to damp hair after washing, allowing for better absorption and improved styling results.
- Neglecting the Scalp: People often focus only on the lengths of their hair and ignore the scalp, missing out on potential benefits. Applying serum to the scalp can help promote hair health and support thicker-looking hair, essential for those with thin hair.
- Using the Wrong Serum: Choosing a serum that doesn’t cater to specific hair needs can lead to ineffective results. For thin hair, it’s crucial to select a lightweight serum that nourishes without adding weight, enhancing volume instead of flattening it.
- Inconsistent Use: Many users do not apply serums consistently, which can hinder their effectiveness over time. To see significant results, it’s important to incorporate the serum into your daily hair care routine and follow the recommended usage guidelines.
- Not Combating Environmental Factors: Failing to consider environmental damage can be a mistake, especially for thin hair that is more susceptible to breakage. Using serums that offer protection against UV rays and pollution can help maintain hair integrity and health.
How Often Should You Use Hair Serum for Best Results?
As a night treatment, hair serum can work wonders by allowing the ingredients to penetrate deeply while you sleep, which is particularly useful for those with dry or damaged hair. This method can lead to healthier-looking hair by morning, as it nourishes and revitalizes while you rest.
Finally, using serum after washing while the hair is still damp is a great way to lock in moisture and protect the hair from environmental factors throughout the day. This technique can also minimize frizz and enhance shine, making it a popular choice for maintaining healthy thin hair.
What Additional Tips Can Help You Care for Thin Hair?
To effectively care for thin hair, consider the following tips:
- Choose the Right Shampoo: Selecting a volumizing shampoo specifically designed for thin hair can help add body and lift. Look for sulfate-free formulas that cleanse without stripping essential oils, as this can prevent further damage and maintain moisture levels.
- Use Lightweight Conditioners: Opt for lightweight conditioners that won’t weigh hair down, as heavy products can leave thin hair looking flat. Focus on applying conditioner mainly to the ends, where hair is typically drier, to avoid excess oil on the scalp.
- Incorporate a Serum: The best serum for thin hair should contain ingredients that promote shine and manageability without adding weight. Serums with silicones can help smooth frizz and protect against heat damage, while those with natural oils can nourish and strengthen strands.
- Avoid Heat Styling: Frequent use of heat styling tools can exacerbate damage to thin hair. Whenever possible, air-dry your hair and embrace natural styles, or use heat protectants when styling to minimize the risk of breakage.
- Regular Trims: Keeping thin hair healthy with regular trims can help prevent split ends and breakage. Aim for a trim every six to eight weeks to maintain the shape and vitality of your hair.
- Scalp Care: A healthy scalp is crucial for thin hair growth. Regularly exfoliating the scalp and using products with ingredients like tea tree oil or salicylic acid can help maintain a clean and balanced environment for hair follicles.
- Avoid Tight Hairstyles: Styles that pull on the hair can cause stress and lead to traction alopecia. Opt for looser hairstyles that allow for movement and reduce tension on the hair shaft.
- Diet and Nutrition: A balanced diet rich in vitamins and minerals can significantly impact hair health. Incorporate foods high in omega-3 fatty acids, biotin, and protein to support hair growth and strength from within.