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The Best Hair Serums For
Strong, Thick-Looking Hair
Latest update: May 19, 2026
Glossy, shiny locks are just a few drops away
Many of us dedicate a lot of time and effort to our skincare routine but often overlook the importance of tending to our hair and scalp. But don’t worry, this doesn’t mean having to clutter your bathroom cabinet with a bunch of new products. A quality hair serum is a do-it-all hair product that can support a healthy scalp and glossy strands. As long as you find the right one.
What is a hair serum?
Similar to face serums, hair serums are formulated with nutrients and other nourishing ingredients to deliver these to the scalp and strands. Unlike hair oil, hair serums are incredibly useful because of their multi-tasking properties. Hair serums can support moisture, strengthen strands, and maintain a hydrated scalp, for hair that looks thick, healthy, and shiny.
Serums for hair can soften the hair for smooth-looking strands. They might target a specific concern such as scalp health, dryness, breakage, density, or volume but the best serums can meet a whole range of hair needs.
TOP 5 HAIR SERUMS OF 2026
1. Biotin Boost Hair Serum
by BeautyLux[1]
PROS
CONS
For scalp and hair
Features amino acids, biotin, vitamin E, and herbal extracts
Multi-tasking formula
Refreshing scent and lightweight, non-greasy texture
Vegan-friendly and cruelty-free
Free of sulfates, parabens, and silicones
Money-back guarantee
Made in the USA
Due to high demand, frequently sold out online
Only available online
The Bottom Line
BeautyLux Biotin Boost Hair Serum is a multi-tasking serum featuring premium ingredients including protein-rich amino acids, biotin (or vitamin B7), vitamin E, as well as a wide range of botanical extracts such as pea sprout extract, wheat germ extract, sage, and turmeric to provide additional antioxidant and nutrient support to the hair and scalp.
This hair serum supports a replenished and moisturized feel to the scalp, while supporting the appearance of thickness, strength, and volume in your locks. Thanks to its lightweight texture, it adds a quick boost of shine to hair without weighing it down.
This vegan-friendly formula is free from sulfates, parabens, and silicones, and is manufactured in the USA. To top it off, the brand has a fantastic Subscribe & Save program which means you can get up to 15% OFF all products plus free shipping. All of their products come with a 90-day money-back guarantee.
GRADE
A+
5. Biotin Hair Serum
by Pureauty
PROS
CONS
Contains biotin
Pea sprout extract
For scalp and strands
Cruelty-free
Best used overnight
Best used with the brand's own shampoo and conditioner
Biotin Hair Serum by Pureauty is made to target hair thickness, strength, and density. It is formulated with key ingredients like biotin, pea sprout extract, and panthenol to target both the scalp and hair. However, the instructions point out that the product is best used overnight, which may be inconvenient for some people looking to add immediate shine or glossiness for the daytime. Additionally, you may also want to note that they state that this hair serum is best used alongside their own shampoo and conditioner.
The Bottom Line
GRADE
C
Our Choice
by BeautyLux[1]
Beauty Lux Biotin Boost Hair Serum
US made with Globally Sourced Ingredients
Biotin, Vitamin E, and Amino Acids
Vegan, Cruelty-Free, and Paraben-Free
Free Shipping on Orders over $50
Based on 3739 Reviews of BeautyLux
*These statements have not been evaluated by the FDA Food & Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.
Note: The information provided by this website or this company is not a substitute for a face-to-face consultation with your physician and should not be construed as professional medical advice. The testimonials on this website are individual cases and do not guarantee that you will get the same results. All content, including text, graphics, images and information, contained on or available through this web site is for general information purposes only.
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Trademarks utilized on our website belong to their respective owners and no implied or expressed endorsement of our website or services is intended. Rankings can be affected by the relationship Smarter Choices has with our top picks.
[1] This website is owned and operated by and BeautyLux® brands.
Nourishing the scalp with vitamins, proteins, and antioxidants may support a healthy environment for hair follicles. Vitamin E and vitamin B7, also known as biotin, are both important vitamins for the wellbeing of the scalp and hair. Vitamin E especially may help support hair density, shine, and strength because of its antioxidant-supporting properties. Antioxidants are thought to help fight oxidative stress, which may affect the skin - including the scalp. In fact, research suggests that oxidative stress may impact on the quality and growth of hair. Supporting the scalp with antioxidants has the potential to help maintain the scalp and combat dryness.*[1]
Biotin (or Vitamin B7)
Vitamin E
Amino Acids
TOP-TRENDING INGREDIENTS TO LOOK FOR:
Panthenol
Antioxidants
Plant-Based Extracts
Sulfates
Parabens
INGREDIENTS TO TRY TO AVOID:
Mineral Oils
Silicones
When it comes to taking care of our hair, it’s all about finding the right fit. But sometimes it’s hard to know where to begin. Trying product after product can be exhausting, not to mention expensive!
Nobody wants to waste their time and money on a product that doesn't meet their needs or expectations. And when it comes to our scalp and hair, we all want to find the perfect match.
Feeling dry? Locks looking dull? No thanks! Instead, say yes to hair that looks strong and glossy and a scalp that feels good. Check out of the best hair serums of 2026.
How to choose the best hair serums for volume, shine, and strength:
What to look for and what to try to avoid
Ingredient Transparency: Always check that the brand discloses a full list of their ingredients and explains what’s inside their products.
Fair Prices: If you find a hair serum formulated with ingredients like those listed above at a super low price, this might seem too good to be true. And unfortunately that’s usually the case. When it comes to your hair and scalp it’s generally a better option not to compromise on quality and choose products that are fairly priced.
Money-Back Guarantee: Why waste your money (and time) on a product that doesn’t work for you? A money-back guarantee shows that the company truly stands behind their products.
Lifestyle Suitability: Are the products cruelty-free, vegan, and clean? These are important factors to consider, especially as more and more consumers are becoming conscious about the types of products absorbed by their body.
ALSO CONSIDER THESE:
Unreviewed Products: It’s a good idea to choose brands that disclose their verified product reviews. Reviews not only give you a good idea of what the product is really like, but many consumers offer tips based on their own experiences.
Skipping Your Research: Always do your research before you buy. With so many different options out there it’s important to choose haircare products carefully.
Skimping on Quality: As mentioned above, it’s rarely worth it to choose price over quality. Look for high-quality ingredients whenever possible.
Harsh Chemicals, Parabens, Sulfates, or Silicones: With so many clean beauty products available, there’s no reason to settle on a hair serum that potentially contains unwanted ingredients. It’s important to take care of your scalp and hair the right way. Look for labels that specifically mention the exclusion of ingredients like parabens, sulfates, and silicones.
TRY TO AVOID:
More and more people are reaching for a hair serum is to boost the appearance of shine, volume, and thickness in hair. Especially those who might feel that their hair looks thin, limp, and lifeless.
Another major benefit of hair serum is that it addresses one of the most neglected aspects of hair maintenance: the scalp. You simply can’t have healthy hair without a healthy scalp. Think of it like the soil you’d use to plant your backyard flowers. If the soil is in poor condition it will affect the well-being of the flowers growing in it too.
Using a high-quality hair serum can help amp up your hair and scalp-care routine!
The best hair serums for dry, dull, and limp-looking hair contain ingredients that target a wide range of concerns. But with new products popping up constantly, finding the right multi-tasking hair serum can be a challenge.
From texture to ingredients, there are just so many things to consider when looking for the best hair serum for you. The most important factor to consider overall is the quality of the serum.
When it comes to supporting unhappy hair and choosing a quality hair serum, knowing what to look for and what to try to avoid can help you find the one that suits you best.
There are some other considerations not to be missed when you’re looking for the best serum for strong, thick-looking hair:
Who should use a hair serum?
Hair serums can be used by anyone at any age! They are particularly helpful for those looking for additional hydration, volume, and thickness.
That being said, many of us tend to neglect our scalp health. Nourishing and hydrating the scalp can be beneficial for anyone to help counteract the effects of environmental aggressors or changes in weather.
Itchiness
Flakiness
Redness
Dry patches
POTENTIAL SIGNS OF AN UNHAPPY SCALP INCLUDE:
Excess oiliness
Limpness
Brittleness
Dull, dry hair
Note: These statements are not intended to diagnose, treat, cure, or prevent any disease or condition, nor are they intended to be substitutes for professional medical advice. Always consult your physician or other qualified healthcare provider for accurate advice, diagnosis, and treatment plan.
Target dry, dull hair
Help the scalp feel nourished
Boost the look of shine and strength
Support volume and texture
Provide nutrients to the scalp and hair
A HIGH-QUALITY HAIR SERUM MAY:
A poorly maintained scalp may impact the hair and potentially cause breakage, dryness, a rough hair texture, and dullness. According to studies, it may even impact hair fall as well as hair growth.[1]
What are the benefits of using a hair serum?
Protein is another key factor in maintaining hair and scalp health. Your hair is primarily made up of a protein called keratin. What does your body need to produce keratin? Amino acids. They may help to add strength and moisture to the scalp and strands, and support elasticity, softness, and less breakage.[2]
Nourishing your scalp and strands with moisture and nutrients may help fight dryness, frizz, breakage, and dullness. A high-quality hair serum may support the appearance of strong and shiny tresses for hair that looks and feels healthy and silky.
Include unwanted, additional ingredients
Provide insufficient hydration and moisture
Weigh down the hair
Make hair appear greasy
Leave a sticky, waxy film on the hair
HOW SOME HAIR SERUMS MAY NOT MEET YOUR NEEDS
2. Pure Plenty Nourishing Scalp Serum
by Intelligent Nutrients
PROS
CONS
Targets the scalp
Contains pea sprout extract and antioxidants
Lightweight texture
Vegan and cruelty-free
Paraben & SLS-fre
Price
No vitamins added
14-day return policy
The Bottom Line
The Pure Plenty Nourishing Scalp Serum by Intelligent Nutrients is made to provide support and nourishment to the scalp and support the appearance of thickness and volume. Although it contains ingredients such as pea sprout extract, caffeine, and other plant-based extracts, the formula doesn't feature ingredients like biotin or other vitamins. Additionally, some may want to note the price as well as the 14-day return policy.
GRADE
B+
3. Softening and Smoothing Serum
by Rossano Ferretti
PROS
CONS
With coconut, shea-butter and bamboo extract
Formulated to fight frizziness and dryness
Includes biotin
Vegan and cruelty-free
Not for all hair types
14-day return policy
Softening and Smoothing Serum by Rossano Ferretti is made with ingredients that include nourishing and hydrating coconut and shea butter as well as biotin-containing bamboo extract. It is vegan-friendly and cruelty-free and is formulated specifically for thick, coarse hair. Some may want to note that because it's made for thick, coarse hair it may not suit all hair types. Additionally, the brand only offers a 14-return policy.
The Bottom Line
GRADE
B
4. Weightless Shine Working Serum
by Kristin Ess
PROS
CONS
Lightweight formula
Contains bamboo extract
For shine and smoothness
Price
Suitable for vegans and paraben-free
Weightless Shine Working Serum by Kristin Ess is a solid choice featuring keratin, jojoba oil, and coffee seed oil to lock in moisture and add shine to strands. It is an affordable option and is suitable for vegans while being paraben-free. However, there is no mention of whether it provides additional scalp care and the formula doesn't include vitamins like biotin.
The Bottom Line
Only targets strands
No vitamins
GRADE
C+
Note: Individual results may vary.
Citations
DISCLAIMER: This scientific research is for informational purposes only. The results reported may not necessarily occur in all individuals. Smarter Choices provides this information as a service but does not endorse it. This information should not be read to recommend or endorse any specific products.
1. Trüeb, Ralph M et al. “Scalp Condition Impacts Hair Growth and Retention via Oxidative Stress.” International journal of trichology vol. 10,6 (2018): 262-270. doi:10.4103/ijt.ijt_57_18
2. Yang, Fei-Chi et al. “The structure of people's hair.” PeerJ vol. 2 e619. 14 Oct. 2014, doi:10.7717/peerj.61