The Ordinary Multi-Peptide Serum for Hair Density — 2 fl oz, Lightweight Leave-In for Thicker, Fuller Hair

The Ordinary Multi-Peptide Serum for Hair Density is a concentrated, lightweight leave-in serum formulated to support the scalp and help hair appear thicker, fuller, and denser over time.

This concentrated formula combines multiple peptide complexes with botanical extracts and caffeine to target scalp health and improve the visible fullness of hair. Designed for daily use, the serum is lightweight, easy to apply, and built to layer under styling products without weighing hair down. It focuses on creating a healthier scalp environment so hair can look more voluminous and resilient with consistent application.

How does this serum work to make hair look thicker?

The serum uses a blend of advanced peptide technologies alongside plant-derived extracts and a soluble caffeine fraction to support scalp vigor and improve hair’s visual density. While results depend on consistent use, the concentrated actives are chosen to help the hair appear fuller by targeting the scalp where hair emerges.

• Multi-peptide complexes designed to target the scalp environment.
• Plant extracts to nourish and balance the scalp surface.
• High-solubility caffeine to help enhance the appearance of hair vitality.

How do I use the serum in my routine?

Apply a few drops directly to a clean, dry scalp once daily—many prefer bedtime—to allow the lightweight formula to be left in place. Gently massage the drops into targeted areas; no rinsing is required, and it can be used before styling.

• Use on clean, dry scalp for best absorption.
• Apply a few drops to thinning or targeted zones, then massage in.
• Leave in and style as usual; compatible with daily hair care products.

What are the key ingredients and why are they included?

The formula blends several trademarked peptide technologies with botanicals to create a multi-targeted approach: some actives support the scalp environment, others aim to improve the visible fullness of hair, and plant extracts help nourish and soothe. The combination is intended to deliver a concentrated, modern approach to improving hair density appearance.

• Peptide complexes known for targeting scalp and hair vitality.
• Botanical extracts such as pea and tea leaf derivatives for nourishment.
• High-solubility caffeine to help energize the scalp feel.

Are there any lifestyle or safety considerations?

The serum is formulated without animal-derived ingredients and avoids alcohol and silicones, making it suitable for routine use for many users. As with any concentrated leave-in treatment, patch testing is recommended if you have sensitive skin; discontinue use if irritation occurs.

• Vegan-friendly and cruelty-free formulation.
• Free from silicones and denaturing alcohols.
• Patch-test prior to full use if you have a sensitive scalp.

Who is this for: The Ordinary Multi-Peptide Serum for Hair Density is aimed at anyone seeking a targeted, leave-in treatment to improve the appearance of hair fullness and scalp health. It suits people with fine or thinning-looking hair who want a lightweight nightly or daily booster that layers easily with other styling and care products. Avoid if you prefer rinse-off treatments or have known sensitivities to concentrated actives.

Ingredients

Aqua (Water), Propanediol, Butylene Glycol, Glycerin, Caffeine, Biotinoyl Tripeptide-1, Acetyl Tetrapeptide-3, Larix Europaea Wood Extract, Pisum Sativum Extract, Scutellaria Baicalensis Root Extract, Triticum Vulgare Germ Extract, Glycine Soja Germ Extract, Trifolium Pratense Flower Extract, Camellia Sinensis Leaf Extract, Apigenin, Oleanolic Acid, Arginine, Glycine, Calcium Gluconate, Zinc Chloride, Lactic Acid, Gluconolactone, Dextran, Maltodextrin, Hydroxyethylcellulose, Xanthan Gum, Pentylene Glycol, Dimethyl Isosorbide, Polysorbate 20, PPG-26-Buteth-26, PEG-40 Hydrogenated Castor Oil, Trisodium Ethylenediamine Disuccinate, Sodium Metabisulfite, Sodium Benzoate, Phenoxyethanol, Chlorphenesin.