The Ordinary Scalp Serum — Natural Moisturizing Factors + Hyaluronic Acid, 2 fl oz, lightweight hydrating leave-in

The Ordinary Natural Moisturizing Factors + HA for Scalp is a lightweight, leave-in serum that hydrates the scalp using hyaluronic acid, squalane, and compounds that mimic the skin’s natural moisturizing factors.

This milky, fast-absorbing formula is created to support scalp comfort and barrier health without leaving residue on hair. Designed as a daily treatment, the serum delivers moisture to the scalp surface while keeping strands light and non-greasy. It’s free from silicones, alcohol, and animal-derived ingredients, and is suitable for anyone seeking targeted scalp hydration from a cruelty-free product.

How does this serum moisturize without making hair greasy?

The Ordinary combines humectants and light emollients that attract and retain water at the scalp while using low-weight oils that absorb quickly. The milky, non-oily texture prevents heavy buildup on hair shafts so hair remains manageable after application.

• Hyaluronic acid draws hydration to the scalp surface.
• Squalane provides lightweight nourishment and mimics natural lipids.
• Formulated to avoid silicones and heavy oils that can weigh hair down.
• Leave-in application so product stays on the scalp rather than coating hair.

When and how should I apply the scalp serum for best results?

Use the serum once daily on a clean, dry scalp—many users prefer applying at bedtime to allow overnight absorption. Dispense a few drops directly onto the scalp and gently massage to spread the product into the skin; do not rinse out.

• Apply to dry, towel-dried, or detangled hair roots.
• Massage until absorbed, focusing on areas of dryness or discomfort.
• Use daily as a leave-in treatment; no need to wash out.
• Start with a small amount and increase if more targeted coverage is needed.

What ingredients are key, and are there any notable exclusions?

The formula highlights natural moisturizing factors combined with hyaluronic acid and squalane to support the scalp’s barrier. It intentionally omits silicones, alcohol, and gluten, and is formulated as vegan and cruelty-free to meet clean-beauty preferences.

• Primary actives: hyaluronic acid and squalane for hydration and lipid support.
• Includes compounds that mimic the skin’s own moisturizing factors.
• Free from silicones, alcohol, and gluten; vegan and cruelty-free.
• Light, milky base designed for quick absorption without stickiness.

Will this serum work with my current haircare routine?

This leave-in scalp serum is compatible with most hair products and can be layered beneath styling and cleansing products. Because it’s formulated without heavy oils or silicones, it won’t typically interfere with styling or cause buildup when used as directed.

• Layer under regular conditioners and styling treatments without heaviness.
• Safe to use alongside shampoos and topical scalp treatments, but patch-test if combining with medicated products.
• Works on all hair types since it targets the skin at the scalp rather than hair fibers.
• Daily use can be integrated into morning or evening routines.

Who is this for: The Ordinary Natural Moisturizing Factors + HA for Scalp suits anyone wanting targeted scalp hydration without greasy residue—people with dry or tight scalps, those who dislike heavy leave-in oils, or anyone seeking a lightweight, vegan, and cruelty-free daily scalp serum. It’s formulated to support the scalp’s surface hydration and is best used as a regular, leave-in treatment alongside your usual haircare products.

Ingredients

Aqua (Water), Squalane, C12-13 Alkyl Glyceryl Hydrolyzed Hyaluronate, Arginine, Aspartic Acid, Glycine, Alanine, Serine, Valine, Isoleucine, Proline, Threonine, Histidine, Phenylalanine, Glutamic Acid, Glucose, Fructose, Sucrose, PCA, Sodium PCA, Zinc PCA, Magnesium PCA, Manganese PCA, Urea, Sodium Lactate, Lactic Acid, Hexyl Nicotinate, Lauryl Glucoside, Myristyl Glucoside, Polyglyceryl-6 Laurate, Isoceteth-20, Dextrin, Hexylene Glycol, Potassium Sorbate, Phenoxyethanol, Chlorphenesin.