Multi-Peptide Serum for Hair Density
60 mL · Water-based leave-in cosmetic
$24.00 USD$0.40 / mL · Recorded 2026-10-20[1]
Editorial draft · Scientific review pending · US label checked 2026-10-20
What should I know first?
The brand positions this as a cosmetic for fuller-looking hair. The selected peptides are Biotinoyl Tripeptide-1 and Acetyl Tetrapeptide-3.[1]
Ingredient or blend research is separate from evidence for this finished bottle.
Which peptides are in it?Selected names, not the complete formula
Biotinoyl Tripeptide-1
The manufacturer lists this peptide alongside apigenin and oleanolic acid in Procapil.[1]
Understand this ingredient →Acetyl Tetrapeptide-3
The manufacturer identifies this peptide in Capixyl, a multi-ingredient system.[1]
Understand this ingredient →Check the full current package; formulas can vary by date and market. Blend percentages are not verified pure-peptide amounts.
What does the research tell us?A different formula, not a test of this bottle
A 24-week randomized trial in 32 people compared another combination containing Acetyl Tetrapeptide-3 with 3% minoxidil. Both groups improved.[2]
Our interpretation: this does not establish how The Ordinary serum performs. A nonsignificant difference between treatments is not proof of equivalence. The study cannot isolate the peptide’s contribution.
This is one selected formulation study, not a complete review of hair-loss treatments.
Before you use itThe manufacturer’s directions and precautions
The brand describes once-daily use on a clean, dry scalp and advises patch testing. If irritation develops, it says to rinse, stop use and consult a physician. Follow your current package.[1]
References and access limitsStudy design, disclosures and what was inspected
- Manufacturer labelMulti-Peptide Serum for Hair Density — US manufacturer label and 60 mL offer
Evidence and limitations for reference 1
- What this supports here
- US 60 mL presentation, USD 24 observation, selected names and directions.
- What it cannot establish
- Commercial source, not independent product testing. Individual pure-peptide amounts are not established by blend names. Formula and offer can change.
- Commercial context and disclosures
- Published by the seller.
- What we inspected
- US product page, selected INCI names, offer and directions inspected. No finished-product clinical dossier reviewed.
- Human formulation study
Lueangarun S, Panchaprateep R 2020. Journal of Clinical and Aesthetic Dermatology 13(10):32–37.
Herbal extract combination versus 3% minoxidil: a 24-week randomized trialEvidence and limitations for reference 2
- What was studied
- 32 participants; randomized triple-blind active-comparator trial; 24 weeks; no placebo arm.
- What was reported
- Both groups improved; no statistically significant between-group difference in terminal hair-count increase.
- What this supports here
- A different multi-ingredient formulation containing Acetyl Tetrapeptide-3.
- What it cannot establish
- Different product; cannot isolate the peptide or establish equivalence to minoxidil. Small study, limited duration.
- Commercial context and disclosures
- Authors report no funding and no relevant conflicts; not independently audited.
- What we inspected
- PMC full text: abstract, methods, results and disclosures inspected.
Check the current offer
Recorded price excludes tax and shipping. Confirm the size and current offer with the brand.
Visit The Ordinary Manufacturer link · No affiliate commission on this link