The Ordinary Scalp Hydration Serum — Lightweight Hyaluronic Acid + Squalane, 2 fl oz

The Ordinary Natural Moisturizing Factors + HA For Scalp is a lightweight, leave-in scalp serum that hydrates and helps maintain the scalp's barrier without weighing hair down.

This milky, fast-absorbing formula combines components that mimic the skin’s own natural moisturizing factors with hyaluronic acid and squalane to deliver targeted hydration to the scalp. Designed to be applied directly to a clean, dry scalp, the serum aims to soothe feelings of dryness while remaining non-greasy and suitable for daily use. It’s formulated free of silicones, alcohol, gluten, and animal-derived ingredients, and it won’t leave hair heavy or sticky.

How does this serum hydrate the scalp without making hair greasy?

The Ordinary blends low-weight humectants and lightweight emollients so moisture is drawn into the scalp and held in place without coating the hair shaft. The texture is milky rather than oily, which helps it absorb quickly and leave minimal residue.

• Hyaluronic acid attracts and retains water at the surface.
• Squalane provides light emollience without heaviness.
• Natural Moisturizing Factors mimic skin’s own moisturizing components.
• Fast-absorbing milky base reduces visible buildup on hair.

When and how should I use this scalp serum for best results?

Use it as a daily leave-in treatment, ideally on a clean, dry scalp. Apply a few drops directly to areas that feel dry or tight and massage gently to distribute the product evenly; nightly use is recommended for consistent hydration.

• Apply to clean, dry scalp once daily, preferably at bedtime.
• Dispense a few drops per section; massage until absorbed.
• No rinsing required—style hair as usual after absorption.
• Can be used alongside other topical hair or scalp products if layered thoughtfully.

Is this suitable for my hair type and routine?

The serum is formulated to be lightweight and non-greasy, making it compatible with most hair types, including fine, oily, and chemically treated hair. It targets the scalp rather than the lengths, so it won’t interfere with conditioning treatments or styling products when used as directed.

• Safe for fine and flat hair because it won’t add weight.
• Works with colored or chemically treated hair; focus is scalp-only.
• Pairs well with leave-in conditioners applied to hair ends.
• Vegan and cruelty-free for those seeking ethical options.

What ingredients are key and what is this formula free from?

The formula emphasizes molecules that mimic the scalp’s natural hydration system—humectants, natural moisturizing factors, hyaluronic acid, and squalane. It deliberately omits silicones, alcohol, gluten, and animal-derived ingredients, appealing to people who prefer minimal and clear formulations.

• Key actives: natural moisturizing factors, hyaluronic acid, squalane.
• Free from silicones and drying alcohols that can weigh or irritate.
• Vegan and cruelty-free; suitable for conscious shoppers.
• Light milky texture designed for rapid absorption.

Who is this for: This product is intended for anyone looking to relieve and maintain scalp hydration without adding oiliness or weight to hair. It’s a practical choice for people with dry or tight-feeling scalps, those who want a simple daily leave-in scalp treatment, and users who prefer formulations free from silicones, alcohol, and animal-derived ingredients. If you need targeted scalp hydration that fits into a regular hair-care routine without altering styling results, this lightweight serum is engineered to integrate seamlessly.

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.