How To Boost Hair Density With Hair Growth Serums

Beautiful young woman applying serum onto her healthy long hair at home

Key Points

  • Hair density is the amount of hair that grows per square inch of your scalp.

  • High hair density means a thicker, healthier head of hair!

  • Increase your hair density with healthy hair and scalp habits, including a growth-inducing hair serum.

  • Try these top hair serums for growth and find the hair density of your dreams.

Increase your hair density at the source by nourishing your scalp. Use these top hair serums to make your scalp happy and grow thick, healthy hair. With the right products, patience, and consistency, it's possible to grow the thick hair you want.

If you have sudden or extreme hair loss, see a doctor or dermatologist to determine the cause and create a proper plan of action to grow your hair. If you're dealing with gradual, age-related, or other manageable loss of hair density, use this guide to regain healthy-looking hair and confidence.

What Is Hair Density?

Hair density is the number of hair follicles per square inch of scalp. It's different from hair thickness, which is the diameter of each hair strand. Hair density affects the appearance of your hair, as well as the way it feels and behaves.

People with high hair density have more hair follicles per square inch of scalp, which gives their hair a fuller, thicker appearance. People with low hair density have fewer hair follicles per square inch of scalp, which makes their hair look thinner and less voluminous.

Several factors affect hair density, including genetics, age, hormones, and medical conditions. It declines with age and is often difficult to recover. It's also affected by the way you care for your hair. For example, excessive heat styling damages hair follicles and leads to hair loss.

The average hair density is 100-200 hairs per square inch of scalp. Hair density varies from person to person and even on different areas of your scalp.

Determining Hair Density

If your hair feels too thin, you may want to check the density of it. Having high-density hair gives your hair a full, healthy, voluminous appearance. If you feel that you have thin hair, determine your hair density to see if there's room for improvement!

There are a few ways to determine your hair density. The most accurate way is to have a doctor or dermatologist count the number of hair follicles per square inch of your scalp using an imaging device. However, this isn't always practical. There are a few simpler methods that you can use at home to estimate your hair density. Perform these tests when your hair is dry, and take several measurements for more accurate results.

The ponytail test is a simple way to get a rough estimate of your hair density. Secure your hair into a ponytail and measure the circumference of the ponytail. If the circumference is less than two inches, you likely have low hair density. If the circumference is two to three inches, you have medium hair density. If the circumference is more than three inches, you have high hair density.

The scalp test is a bit more accurate than the ponytail test. Stand in front of a mirror and tilt your head slightly forward. Look at your scalp and see if you can see any of the scalp through your hair. If you can see a lot of scalp, you likely have low hair density. If you can only see a small amount of scalp, you have medium or high hair density.

Boosting Hair Density

Hair density is a reflection of your hair and scalp health. Many other factors contribute, but you can improve your hair density by nourishing your body with vitamins, water, and proper nutrition. Establishing a healthy hair routine is also good for your hair density. Follow some of these expert tips to improve your hair density:

  1. Get regular haircuts to remove split ends and prevent damage. Split ends make your hair look thinner and less healthy.

  2. Use gentle hair care products free of harsh chemicals that may damage your hair and make it more prone to breakage. Choose hair care products labeled as "gentle" or "natural."

  3. Avoid heat styling because it damages your hair and makes it more likely to break. If you do use heat styling, use a heat-protectant serum to protect your hair.

  4. Eat a healthy diet rich in protein and other nutrients that are essential for hair growth. Make sure to include plenty of protein-rich foods as well as vitamins and minerals, including iron, zinc, biotin, and vitamin A.

  5. Take supplements that promote hair growth. These supplements often contain ingredients such as biotin, saw palmetto, and nettle extract.

  6. Massage your scalp regularly and gently with your fingertips or a scalp massager. Scalp massage improves blood circulation to the scalp, which promotes hair growth.

  7. Manage stress through healthy methods such as exercise, yoga, or meditation. Stress contributes to hair loss.

  8. Get enough sleep. Sleep is important for overall health, including hair health. Aim for seven to eight hours of sleep per night.

  9. Be patient! It takes time to see results from any hair loss treatment. Don't give up if you don't see results immediately.

  10. Use scalp treatments that reduce inflammation, improve blood circulation, exfoliate, and hydrate the scalp. These scalp serums promote hair growth and increase hair density over time.

Scalp Treatments for Boosting Hair Density

There are plenty of home remedies and lifestyle changes to care for your hair. However, if you want to stimulate hair growth more proactively, use a scalp treatment. Here are some common scalp treatments to increase your hair density:


Minoxidil is an FDA-approved treatment for male and female pattern baldness. Minoxidil works by widening blood vessels in the scalp, which increases blood flow to the hair follicles and promotes growth.


Finasteride is an FDA-approved oral medication to treat male-pattern baldness. Finasteride works by blocking the production of dihydrotestosterone (DHT), a hormone that can damage hair follicles.

Saw Palmetto

Saw palmetto is an herbal supplement taken by men. It works by blocking the production of DHT.

Scalp Micropigmentation

Scalp micropigmentation is a cosmetic procedure used to create the appearance of hair growth. It involves injecting pigment into the scalp to create the appearance of hair follicles.

Scalp massage

Scalp massage improves blood circulation to the scalp, which promotes hair growth. To massage your scalp, use your fingertips to make gentle, circular motions all over your scalp.

Benefits of Hair Growth Serums

Hair serums are also an effective, at-home method for increasing hair density. When using a hair serum to promote hair density, follow the directions from your treatment and use it regularly for effective results. Hair serums nourish your scalp and offer many benefits, including:

  • Promoting hair growth: Some hair serums contain ingredients that promote hair growth, such as minoxidil, saw palmetto, and biotin.

  • Reducing inflammation: Inflammation damages hair follicles and leads to hair loss. Hair serums reduce inflammation and help improve hair growth.

  • Improving blood circulation: Good blood circulation is essential for hair growth. Hair serums that improve blood circulation help to promote hair growth.

  • Nourishing the hair follicles: Hair serums nourish the hair follicles and provide them with the nutrients they need to grow healthy hair.

  • Protecting the hair: Hair serums protect hair from damage due to heat styling, sun exposure, and other environmental factors.

Top Hair Serums for Hair Density

Not every hair serum works for everyone. It takes some experimentation or trial and error to find the right serum and regimen for you. Start with some of these highly-rated hair serums to start growing denser hair:

Hair Growth Serum for Thinning Hair
$15.98 ($7.99 / Fl Oz)

by The Ordinary

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03/08/2024 08:37 am GMT

The Ordinary Multipeptide Hair Serum

This budget-friendly hair serum is suitable for all hair types and highly effective at increasing hair growth and density. The Ordinary Multipeptide Hair Serum has active ingredients Procapil to stimulate blood flow, Baicapil to increase hair density, and Redensyl, which targets stem cells deep within the skin to improve density.

Scalp Serum | Revitalize and Detoxify
$48.00 ($48.00 / Fl Oz)


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03/08/2024 09:02 am GMT

Divi Scalp Treatment

Healthy, thick hair starts at the source — your scalp. Nourish your hair follicles and start growing thicker hair with Divi Scalp Serum. This scalp treatment revitalizes and detoxifies your scalp through a combination of amino acids and peptides.

Copper Tripeptide-1 helps to thicken and lengthen your hair by increasing collagen production. This serum also uses the summer 2023 TikTok trend and expert-approved hair treatment — Rosemary leaf extract. Make your scalp happy for healthy hair with Divi Scalp Treatment!

Scalp Therapy Energizing Scalp Serum Revitalizer
$17.59 ($4.40 / Fl Oz)


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03/07/2024 08:32 pm GMT

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PURA D'OR Hair Thinning Therapy Energizing Scalp Serum Revitalizer

Energize your scalp to increase your density with PURA D'OR Hair Thinning Therapy Energizing Scalp Serum Revitalizer. DHT blockers prevent further hair loss and promote more growth on your scalp, caffeine brings blood flow to your scalp to promote growth, and plant extracts nourish your scalp while also promoting hair growth. Trust this Amazon favorite hair care line to increase your hair density and sport a fuller, healthier look!

Dr. Barbara Sturm, Anti-Hair Fall Scalp Serum
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03/07/2024 08:27 pm GMT

Dr. Barbara Sturm Anti-Hair Fall Scalp Serum

This splurge-worthy serum is vegan, silicone-free, and lightweight. Dr. Barbara Sturm Anti-Hair Fall Scalp Serum is a favorite amongst Hollywood skincare specialists. It works through active ingredients — camellia and larch extracts — to treat your hair follicles and promote growth. Vitamin B strengthens hair, and hyaluronic acid moisturizes your skin. The serum also protects your hair from further damage from heat styling, environmental pollutants, and UV rays from the sun.

Women’s Hair Serum
$69.00 ($40.59 / Fl Oz)

by Nutrafol 

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03/07/2024 08:37 pm GMT

Nutrafol Growth Activator

Nutrafol Growth Activator is a plant-based serum and probiotic for your scalp. This serum rebalances the microbiome of your scalp to promote a healthy scalp and more hair growth. According to hair transplant surgeon Dr. Alan J. Bauman, "The serum uses plant exosomes…from the ancient adaptogenic herb known as Ashwagandha. These are tiny bubbles of biochemical messages organisms use for cell-to-cell communication to activate hair growth." 

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Increase Your Density

Patience and consistency are key when it comes to achieving desired hair results. With dedication and the right products, boost hair density and enjoy a fuller, healthier head of hair that you can confidently flaunt.

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