Fragrance-Free
Fragrance-Free
Fragrance-Free
Fragrance-Free
Fragrance-Free
Fragrance-Free
Fragrance-Free
Save $19

The Scalp Serum Trio | 90-Day Supply | 1% Hyaluronic Acid

3 x 30 ml Save $19
4.2
Rated 4.2 out of 5 stars
83 Reviews

The Necessary™ | Care For Your Body | Care For Your Planet

The Scalp Serum (3x 30 ml | 90-Day Supply) is a foundational fragrance-free serum for the scalp. 1% Multi-Molecular Hyaluronic Acid is paired with Vitamin B3 and Vitamin B5 to help delivers intense multi-level hydration to a dry, sensitive scalp, while also balancing and soothing. This leave-in texture is quick-dry and water-light. It leaves no-residue. The Scalp Serum also contains 5% Capixyl™ to support denser, fuller, healthier-looking hair. The Scalp Serum must be used daily for results. Dermatologist-Tested. Hypoallergenic. Non-Comedogenic. Vegan. Color-Safe. The Scalp Serum holds The Seal of Approval by The National Eczema Association.

Clinical Results | 50+ participants used The Shampoo, The Conditioner and The Scalp Serum for 12 Weeks | USA 2022. Q3.

  • 96% Said My Scalp Feels Hydrated
  • 96% Said My Scalp Feels Less Itchy
  • 94% Said My Scalp Feels Less Flaky


    $125

    $144 3 x 30 ml Save $19
    30 ml | $48 3x 30 ml | $125

    Free US Shipping $75+ | Free Returns

    The Necessary™ | Care For Your Body | Care For Your Planet

    The Scalp Serum (3x 30 ml | 90-Day Supply) is a foundational fragrance-free serum for the scalp. 1% Multi-Molecular Hyaluronic Acid is paired with Vitamin B3 and Vitamin B5 to help delivers intense multi-level hydration to a dry, sensitive scalp, while also balancing and soothing. This leave-in texture is quick-dry and water-light. It leaves no-residue. The Scalp Serum also contains 5% Capixyl™ to support denser, fuller, healthier-looking hair. The Scalp Serum must be used daily for results. Dermatologist-Tested. Hypoallergenic. Non-Comedogenic. Vegan. Color-Safe. The Scalp Serum holds The Seal of Approval by The National Eczema Association.

    Clinical Results | 50+ participants used The Shampoo, The Conditioner and The Scalp Serum for 12 Weeks | USA 2022. Q3.

    • 96% Said My Scalp Feels Hydrated
    • 96% Said My Scalp Feels Less Itchy
    • 94% Said My Scalp Feels Less Flaky


      Free US Shipping $75+ | Free Returns

      SET CONTAINS

      BUY IT WITH

      TARGETS

      Scalp Health

      TREATMENT

      Formula Contains:
      1% Hyaluronic Acid
      5% Capixyl™
      Vitamin B3 
      Vitamin B5

      See Ingredients

      TESTED

      Product Is:

      • Dermatologist-Tested
      • Hypoallergenic
      • Non-Comedogenic
      • Certified Vegan 
      • Cruelty-Free
      • EU Compliant

      TEXTURE

      Liquid

      SCENT

      Fragrance-Free

      pH

      4.7 - 5.7

      USAGE

      See Usage

      FOOTPRINT

      Brand Is:

      • 1% For The Planet
      • Certified B Corp
      • Certified Climate Neutral
      • Certified Plastic Neutral
      • Certified FCS
      • How2Recycle

      AWARDS

      2023 Harper’s Bazaar
      2023 Women's Health
      2022 CEW UK | Best Prestige Brand
      2019 NewBeauty Best Unisex Body Brand

      Is The Scalp Serum Oil-Free? Will The Scalp Serum Leave A Residue?

      The Scalp Serum is oil-free. The Scalp Serum is a quick-dry, water-light, and no-residue leave-in serum. The Scalp Serum must be used daily for results. Can be used in damp or dry hair. Fragrance-Free. Dermatologist-Tested. Hypoallergenic. Non-Comedogenic. Vegan. Color-Safe.

      Answer

      Why Is pH Level Mentioned On The Package?

      During the formulation process we optimize the pH of the formula. We believe it directly impacts the safety and efficacy of the formula. The pH objective will vary based on product purpose. On the secondary packaging (carton) we provide a pH range. The reason a pH range is indicated is that pH may vary during the manufacturing process and/or slightly change over time. Formula that does not contain enough water, will not have a pH listed.

      Answer

      Is This Product Certified Eczema-Safe?

      Yes. This product holds The Seal of Approval by the National Eczema Association.

      Answer

      Can I Use The Product If I Am Pregnant?

      We formulate without ingredients on the EU's prohibited substances list (Regulation No.1223/2009, Annex II). This formula is Dermatologist-Tested and Hypoallergenic. If you have any specific concerns, we recommend consulting your doctor prior to use.

      Answer

      Is This Product Certified Gluten-Free, Soy-Free And Nut-Free?

      This product is not certified gluten-free, soy-free or nut-free. This product is manufactured in a facility where gluten, soy and nuts may be used. If you have an allergy to gluten, soy or nuts, we recommend that you do not use this product. If you still wish to try, please consider a patch test.

      Answer

      4.2
      Rated 4.2 out of 5 stars
      Based on 83 reviews
      Total 5 star reviews: 55 Total 4 star reviews: 8 Total 3 star reviews: 5 Total 2 star reviews: 9 Total 1 star reviews: 6
      Write a Review (Opens in a new window)
      83 reviews
      • Patty O.
        Verified Buyer
        Reviewing
        The Scalp Serum | 30-Day Supply | 1% Hyaluronic Acid
        I recommend this product
        What are your skin concerns? Aging
        What are your hair concerns? Thinning
        Rated 5 out of 5 stars
        11/18/25
        Growing new hair

        I actually have new hair growing in the area where I apply the serum. I’m very pleased with the results.

        Was this helpful?
      • Mary K.
        Verified Buyer
        Reviewing
        The Scalp Serum Trio | 90-Day Supply | 1% Hyaluronic Acid
        I recommend this product
        Rated 5 out of 5 stars
        11/4/25
        Products

        This order was fine. I’m missing the previous 2 orders as they were sent to the wrong address. I addressed this issue and was told that I would receive the orders I paid for. They never arrived. Please follow up and let me know. I love the products and wish to continue receiving them. Thanks Mary Kelly

        Was this helpful?
        N Profile picture for Nécessaire
        Nécessaire
        11/6/25

        Thank you for your review. While we're delighted to hear you love The Scalp Serum, we are sorry to hear about the delivery issues you've experienced. Our Customer Care team has contacted you directly to resolve this matter. We appreciate your patience and your continued support.

      • Brenda
        Reviewing
        The Scalp Serum | 30-Day Supply | 1% Hyaluronic Acid
        I recommend this product
        Rated 5 out of 5 stars
        10/6/25
        5 Stars

        It’s so light that it doesn’t weigh down my fine thin hair. I have been using this for about 2weeks and my scalp feels less dry and my hair is already soft amd shiny. I also started using the rosemary shampoo amd conditioner at the same time and i love all the products. I definitely will continue using.

        Was this helpful?
      • Donna Z.
        Verified Buyer
        Reviewing
        The Scalp Serum Trio | 90-Day Supply | 1% Hyaluronic Acid
        I recommend this product
        What are your hair concerns? Thinning
        Rated 5 out of 5 stars
        8/30/25
        This Serum Really Works

        I take hair vitamins, Minoxidil, and have used many thickening shampoos and conditioners. Nothing helped the thinning at my crown until I used this serum. It is amazing.

        Was this helpful?
      • Inaemi D.
        Verified Buyer
        Reviewing
        The Scalp Serum | 30-Day Supply | 1% Hyaluronic Acid
        I recommend this product
        What are your skin concerns? Dryness, Eczema/Psoriasis, Keratosis Pilaris
        What are your hair concerns? Dryness
        Rated 5 out of 5 stars
        6/29/25
        Great

        This is perfect for a scalp for doesn't need oil, instead water based product

        Was this helpful?