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A wooden scalp massager and an unlabeled dropper bottle on a pale green dish, generated illustration
Scalp serum · #6 hair Generated scene, not a product photo
The Ordinary · Hair · Scalp care

The Ordinary Multi-Peptide Serum for Hair Density

A leave-on scalp serum with caffeine, peptides and plant extracts, sold for fuller, healthier-looking hair. Many owners like it, and plenty used a whole bottle and saw nothing.

60 mlSerumCaffeineBiotinoyl tripeptide-1Acetyl tetrapeptide-3Fragrance-free
$24 MSRPAmazon price not shown
Check price on Amazon →

Amazon link · we earn a commission if you buy · $24 MSRP · Amazon price not shown · verified Nov 1, 2026. More stores appear here as each affiliate program approves the site.

Buy it if

  • Your hair looks thinner and you want a low-cost try
  • You will stick with a daily step for months
  • You want no added fragrance

Walk past if

  • You want regrowth; the maker promises only a fuller look
  • Your scalp gets flaky or dry easily; some owners report it
  • You dislike product in your hair; owners report a greasy feel

What's in it

The ingredients that do the work, from the maker’s label.

CaffeineBiotinoyl tripeptide-1Acetyl tetrapeptide-3

Sulfate-free →Fragrance-free →

Not in it: fragrance, essential oils, drying alcohol, sulfates. Nothing on our flag list.

Full ingredient list, from the maker

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

Known issue

Owners often see no change after two to four months, and some report a dry, flaky scalp, greasy roots or hairline breakouts.Ulta and Sephora reviews

What owners say

Filled by the research pass: two or three owner reports from named venues, each linked, each with the date it was read.

If it's not right

Nizoral Anti-Dandruff ShampooNo maker list price for this sizeKetoconazole 1%, labeled by the maker to control flaking, scaling and itching associated with dandruff. The carton says to use it every 3 to 4 days for up to 8 weeks, then only as needed.

Sources

  1. Maker's US page: ingredient list, 60 ml list price, product description.
  2. Ulta reviews, about 900: no change after months, a sensitive and dry scalp, breakouts at the hairline and a greasy feel.
  3. Sephora reviews, about 2,100: no change after two bottles, a dry and flaky scalp, more shedding for some and grease tagged as a complaint.

Ingredient lists from the maker's label, not our measurements.