Best Ouai Scalp Serums Deals of Oct 2026

Updated October 29, 2026Our site contains affiliate links for which we may be compensated.
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OUAI Scalp Serum - Balancing Hair Serum (2 Fl Oz) | With Red Clover Extract, Siberian Ginseng & Peptides, for Thicker, Fuller-Looking Hair, Sulfate Free Scalp Care

Healthy Hair Starts with the Scalp - OUAI's new skin care-inspired serum is unlike other hair care because it gets to the root of healthy hair. This scalp oil supports thicker, fuller-looking hair. Designed to create a healthy barrier, promote hydration, and reduce discomfort for all hair types.
This is the OUAI to Grow - The combination of hyaluronic acid with nourishing Adaptogens like Arctic Root, Siberian Ginseng, and Chaga Mushroom delivers powerful hydration to a dry scalp. Created with OUAI's signature scent Cape Town, this scalp serum features a calming and earthy fragrance with notes of spearmint, ginger, basil, and green fig.
OUAI Means Yes - In that casual Parisian way. OUAI is about being better IRL. It's about having honest conversations with our community. It's about letting go of unrealistic expectations and embracing your imperfections.
Formulas That Get The Job Done - All OUAI hair care products including this soothing scalp oil are carefully crafted to cut styling time and nourish your hair health. We put the good stuff in and leave the bad stuff out, without ever sacrificing quality.
For Real Life, For Real People - OUAI offers luxury hair products at affordable prices that are user-friendly — no glam squad needed. Apply the scalp care serum daily for best results.
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divi Scalp Serum for Thinning Hair, Hair Growth Serum, 30ml | Multi-Peptide Complex, Caffeine, Rosemary Oil, Vegan, Non-Greasy, Thinning Hair, Fuller-Looking Hair, Scalp Serum, 30ml

Independently Studied for Visible Hair Density Results: Formulated to visibly improve the look of hair fullness and density in as little as 6 weeks. In an independent study of 31 participants over 12 weeks of daily use, it worked consistently to nourish hair follicles and improve the overall appearance of thinning hair over time.
Powered by a Multi-Peptide Complex to Support a Healthy Scalp: Copper Tripeptide-1 (GHK-Cu) is a peptide your body naturally produces but makes less of over time. Applied to the scalp, it helps nourish hair follicles and supports the environment where growth happens. Acetyl Tetrapeptide-3 works at the hair root to help reinforce it, and support visible hair volume.
An Invigorating Scalp Ritual You Can Feel Working: When you massage this lightweight, water-based formula directly onto your scalp, you may feel a gentle tingling that signals it's working. No rinsing required. Morning or evening, on wet or dry hair, this leave-in serum fits effortlessly into any Growth Care ritual, making daily scalp care an important part of your hair care routine.
Made for Every Stage of Your Hair Journey: Whether you're managing postpartum hair shedding, dealing with thinning from tight hairstyles or extensions, or noticing scalp buildup, this serum was made with you in mind. Safe for all hair types including color-treated hair and extensions. Apply to a dry or towel-dried scalp, morning or night.
Complete Your Growth Care Routine: This scalp serum is the foundation of a complete scalp and hair health routine. Pair it with divi shampoo, conditioner, and other Growth Care essentials for a regimen built around follicle nourishment and long-term hair density. Try the 15ml for a two week supply, the 30ml for a one-month supply, or choose the 100ml for three months of daily scalp and hair care.
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AVEDA Scalp Solutions Overnight Scalp Renewal Serum | Strengthens & Repairs Scalp Barrier for all Hair Types | Soothes Red, Dry, Irritated Scalp | 98% Naturally Derived*, 1.7 Fl Oz

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Dove

20% Off

Dove Derma Scalp Density Boost 3-in-1 Scalp Serum 1 ct, 2 oz | Prebiotic Glycerin, Zinc, Peptides and Niacinamide, Fortifies Roots, Boosts Visible Density, Use 3 Times Weekly

MOISTURE BARRIER SUPPORT: Use Dove Density Boost Scalp + Hair Therapy 3-in-1 Scalp Serum to help alleviate dry scalp by supporting your scalp's protective moisture barrier with lightweight hydration
ROOT CARE: Incorporate this hydrating scalp serum into your routine to moisturize the scalp, fortify roots, and create a strong foundation for healthier-looking hair with quick absorption and no residue
VISIBLE DENSITY BOOST: Enriched with skin care-inspired actives, including Prebiotic Glycerin, Zinc + Peptides, and Niacinamide, this lightweight scalp serum helps support visible fullness over time
DERMATOLOGIST COLLABORATION: The scalp care formulas in the Density Boost system were developed in collaboration with dermatologists for targeted scalp and hair care in your weekly routine. Suitable for all hair types and color-treated hair.
HOW TO USE: Section hair and apply 2 droppers directly to the temples and hairline for full scalp coverage, then massage gently. Use 3x/week as part of the Density Boost range for best visible results
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K18 FutureIQ Biomimetic Longevity Hair + Scalp Serum, 3.04 oz | Reduce Shedding, Early Grays, Scalp Aging For 19,000 More Hairs, Fewer Grays, Improved Scalp Barrier, Fragrance-Free + Vegan

Anti-Shedding Hair + Scalp Serum for Premature Hair Aging: A lightweight leave-in clinically proven to help reduce shedding, reverse early graying, and protect scalp longevity.
MultiVital technology: The first synergistic multi-pathway system for premature hair aging. Clinical testing demonstrated less shedding at month 1, increased density at month 2, and up to 19,000 more hairs with 70% showing fewer grays at month 3
For All Hair Types + Routines: Works on everyone experiencing shedding, early graying, and scalp aging, including color-treated and chemically treated hair, and men. Non-greasy water-based formula won't weigh hair down for easy nightly use.
How to Use: USE ONCE NIGHTLY. Apply 4 droppers, filled to the line, directly to damp or dry scalp. Distribute evenly and massage in. DO NOT RINSE. 1 bottle = 1 month supply. Use after K18 Detox Shampoo and Mask to futureproof hair from scalp to ends
Fragrance-Free, Vegan + Cruelty-Free: Clean formula with no sulfates, parabens, or phthalates. After the bestselling molecular repair tech, the new FutureIQ category preserves hair by supporting its biology before visible signs of aging accelerate.
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Nioxin Scalp Recovery Soothing Serum | For Itchy Scalp | Anti-Dandruff | For Flaky Scalp | Formulated with Pyrithione Zinc | 3.3 fl oz

Targeted Scalp Relief: Experience targeted relief from dryness, itchiness, redness, and flakiness. The Nioxin Scalp Recovery Purifying Shampoo provides soothing relief, helping you bid farewell to discomfort.
Dandruff Control: With its unique blend of active ingredients, this system effectively combats dandruff from the first use, giving you a flake-free scalp and restored confidence.
Deep Cleansing Action: The shampoo deeply cleanses your scalp, removing impurities and excess oil. Enjoy a refreshed scalp that feels healthier and revitalized.
Nourishes and Hydrates: Enriched with essential nutrients and moisturizers, this system nourishes your scalp and helps maintain its natural moisture balance.
Promotes Hair Growth: Create an optimal environment for hair growth with the Nioxin Scalp Recovery System. It supports the overall health and vitality of your hair, promoting thicker, fuller, and more resilient hair.
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The Ordinary Hair Care Natural Moisturizing Factors + Hyaluronic Acid, Lightweight Hydrating Scalp Serum with Hyaluronic Acid and Squalane, 2 Fl Oz

Natural Moisturizing Factors + HA For Scalp is a light, milky formula designed to support scalp hydration and help ease discomfort caused by dryness. By utilizing a combination of ingredients that mimic natural moisturizing factors, along with hyaluronic acid and squalane that are naturally produced within the skin, this moisturizing serum helps support the scalp’s barrier without sticking to your hair or weighing it down.
MIMICS NATURAL MOISTURE: Formulated with natural moisturizing factors, squalane, and hyaluronic acid to support the scalp's barrier.
NON-GREASY FORMULA: Hydrates the scalp without weighing down hair or leaving it greasy.
DAILY LEAVE-IN TREATMENT: Massage a few drops into a clean, dry scalp once daily, ideally at bedtime.
FREE FROM: Vegan, cruelty-free, silicone-free, alcohol-free, and gluten-free formulation.
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PURA D'OR Hair Thinning Therapy Scalp Serum for Fuller Thick Hair, 4oz | Stronger-Looking Roots, Clinically Tested, Caffeine, Peptides, Rosemary, Green Tea, Daily Care, Sulfate-Free, Men & Women

CLINICALLY TESTED FORMULA FOR THINNING HAIR – Energizing scalp serum with biotin, caffeine, and copper tripeptide helps support fuller-looking volume and healthier-appearing strands by nourishing the scalp for women and men.
HELPS IMPROVE THE APPEARANCE OF SPARSE STRANDS – Designed to support the look of thicker, more voluminous hair while helping minimize the visible signs of thinning without harsh ingredients or heavy residue.
ADVANCED ACTIVE AND BOTANICAL INGREDIENT BLEND – Formulated with premium actives and plant-derived extracts to condition the scalp and support an optimal environment for stronger, fuller-looking hair.
LIGHTWEIGHT ENERGIZING LEAVE-IN SERUM – Fast-absorbing, non-greasy formula revitalizes the scalp and leaves hair feeling soft, refreshed, and manageable for daily use without buildup.
CLEAN AND GENTLE DAILY HAIR CARE – Sulfate and paraben free, cruelty free, and suitable for all hair types including color-treated hair; ideal for everyday use as part of a thinning hair care routine.
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OGX

OGX ProGrowth + Peptide Scalp Serum, 0.33 fl. oz | Strengthens & Densifies, Hydrates the Scalp, Reinforces Roots, Supports Natural Hair Growth

Hair serum: Hydrates and reinforces roots to support natural hair growth for visibly thicker, fuller hair from the root*; fast-absorbing hair serum provides nutrients to fine, thin, or damage-prone hair, curls and coils, or hair with breakage
Results you can see: Get visibly thicker, fuller hair in 30 days*; 81% agree hair feels thicker after 30 days** of daily scalp serum use; mess-free click pen applicator targets fast-absorbing hair serum at the roots
Long7vity Complex: This OGX scalp serum includes peptide, caffeine, and micro-algae for reinforced roots; niacinamide, feverfew, vitamin B5, and mango extract for a healthy scalp; supports scalp health; encourages natural hair growth
Gentle scalp serum: Formulated without fragrance, parabens, sulfated surfactants, or alcohol, so it’s a gentle scalp serum; lightweight hair serum is a gentle yet effective part of a daily hair strengthening and care routine
Click into growth: Once a day, apply 3-6 drops of hair serum to the “Scalp T-Zone” (temples, part, and front hairline) on clean, damp hair or dry hair between washes; gently massage with fingertips; do not rinse
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Our #1 Pick Today
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OUAI Scalp Serum - Balancing Hair Serum (2 Fl Oz) | With Red Clover Extract, Siberian Ginseng & Peptides, for Thicker, Fuller-Looking Hair, Sulfate Free Scalp Care

Healthy Hair Starts with the Scalp - OUAI's new skin care-inspired serum is unlike other hair care because it gets to the root of healthy hair. This scalp oil supports thicker, fuller-looking hair. Designed to create a healthy barrier, promote hydration, and reduce discomfort for all hair types.
This is the OUAI to Grow - The combination of hyaluronic acid with nourishing Adaptogens like Arctic Root, Siberian Ginseng, and Chaga Mushroom delivers powerful hydration to a dry scalp. Created with OUAI's signature scent Cape Town, this scalp serum features a calming and earthy fragrance with notes of spearmint, ginger, basil, and green fig.
OUAI Means Yes - In that casual Parisian way. OUAI is about being better IRL. It's about having honest conversations with our community. It's about letting go of unrealistic expectations and embracing your imperfections.
Formulas That Get The Job Done - All OUAI hair care products including this soothing scalp oil are carefully crafted to cut styling time and nourish your hair health. We put the good stuff in and leave the bad stuff out, without ever sacrificing quality.
For Real Life, For Real People - OUAI offers luxury hair products at affordable prices that are user-friendly — no glam squad needed. Apply the scalp care serum daily for best results.
Details & specs
Check Price
on Amazon.com
Disclaimer: While we make every effort to ensure accuracy, we cannot guarantee that all product specifications, pricing, discounts, and details are complete or error-free. Because information is subject to change, we recommend verifying all details directly with the retailer prior to making a purchase. As an Amazon Associate, we earn from qualifying purchases.

10 Ouai Scalp Serums deals are available from: Amazon, starting from $7.93.

The biggest discount we found is 29% on Pacifica Scalp Love Rosemary Mint Serum - Dry, Flaky, and Itchy Scalp Serum, Hydrating, Moisturizing, and Calming Treatment Formulated with Witch Hazel, Vegan and Cruelty-Free - 2 Fl Oz (64155) at Amazon.

The lowest price we found is $7.93 while the highest is $120.00. Prices for the best Ouai Scalp Serums deals average at $38.04.

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