Evidence-backed review

The Ordinary's Multi-Peptide Hair Serum

  • 28/100
  • Limited Evidence
  • 3 sources

Based on the available, albeit limited, evidence from a single detailed revie.

Updated Aug 17, 2026

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Buy if Individuals seeking to improve hair density and reduce hair loss.

Wait or skip if Comprehensive efficacy across diverse hair types and conditions.

Limited evidence confidence · 28/100

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The Ordinary's Multi-Peptide Hair Serum – Cover Image

The Ordinary

The Ordinary's Multi-Peptide Hair Serum

Skincare

Reviewed

17 claims checked across 5 evidence categories

Claims checked: 17 · Verified sources: 3 · Evidence categories: 5 · Open questions: 3 · Limited evidence confidence · 28/100

  • Well supported
  • Mixed evidence
  • Limited evidence
  • Important caveat

Evidence checklist

We check the product questions most likely to affect a buying decision. Open any item to see the supporting sources, agreement, and limitations.

Performance & outcomes 3 claims checked

The serum's ingredients collectively improve hair density, prevent loss, and stimulate growthLimited evidenceWhat we still need: There is evidence for each of the active ingredients in The Ordinary Hair Serum to contribute to improving hair density, preventing hair loss, and stimulating new hair growth.1 source

There is evidence for each of the active ingredients in The Ordinary Hair Serum to contribute to improving hair density, preventing hair loss, and stimulating new hair growth.

Moderate agreement · 1 source supports

Consistent application for 3-4 months is required for resultsLimited evidenceWhat we still need: Users must be consistent and patient with the serum, as benefits are typically seen after 3 to 4 months of daily use.1 source

Users must be consistent and patient with the serum, as benefits are typically seen after 3 to 4 months of daily use.

Moderate agreement · 1 source supports

Visible results often take months, not weeks.Limited evidenceWhat we still need: Visible results often take months, not weeks.1 source

Visible results often take months, not weeks.

Moderate agreement · 1 source supports

Everyday use & fit 2 claims checked

Capixyl improves follicular strength, size, and blocks DHTLimited evidenceWhat we still need: Capixyl upregulates collagen production, leading to increased follicular size and stronger hair anchoring, while also acting as a natural DHT blocker and anti-inflammatory for the scalp.1 source

Capixyl upregulates collagen production, leading to increased follicular size and stronger hair anchoring, while also acting as a natural DHT blocker and anti-inflammatory for the scalp.

Moderate agreement · 1 source supports

Some users see reduced shedding or improved scalp comfort.Limited evidenceWhat we still need: Some users see reduced shedding or improved scalp comfort.1 source

Some users see reduced shedding or improved scalp comfort.

Moderate agreement · 1 source supports

Quality & reliability 1 claim checked

A number of long-term users report no meaningful improvement even after extendedLimited evidenceWhat we still need: A number of long-term users report no meaningful improvement even after extended use.1 source

A number of long-term users report no meaningful improvement even after extended use.

Moderate agreement · 1 source supports

Value & ownership 2 claims checked

Caffeine stimulates scalp circulation and may block DHTLimited evidenceWhat we still need: Caffeine is included for its ability to stimulate blood circulation to the scalp, providing vital nutrients and oxygen to follicles, and there's some evidence it may also block DHT.1 source

Caffeine is included for its ability to stimulate blood circulation to the scalp, providing vital nutrients and oxygen to follicles, and there's some evidence it may also block DHT.

Moderate agreement · 1 source supports

The Ordinary Multi-Peptide Serum for Hair Density is included among recommendedLimited evidenceWhat we still need: The Ordinary Multi-Peptide Serum for Hair Density is included among recommended hair growth products, but it is not identified as the top overall product in the guide.1 source

The Ordinary Multi-Peptide Serum for Hair Density is included among recommended hair growth products, but it is not identified as the top overall product in the guide.

Moderate agreement · 1 source supports

Other checked claims 9 claims checked

Product is formulated without irritants or harsh chemicalsLimited evidenceWhat we still need: The Ordinary Multi-Peptide Hair Serum is cruelty-free, vegan-free, alcohol-free, and contains no harsh chemicals, silicones, or sulfates, which is beneficial as alcohol can irritate the scalp.1 source

The Ordinary Multi-Peptide Hair Serum is cruelty-free, vegan-free, alcohol-free, and contains no harsh chemicals, silicones, or sulfates, which is beneficial as alcohol can irritate the scalp.

Moderate agreement · 1 source supports

Redensyl promotes hair growth by stimulating stem cellsLimited evidenceWhat we still need: Redensyl, a key ingredient, works by targeting stem cells in the hair bulb to signal hair follicles to enter and stay in the anagen (growth) phase.1 source

Redensyl, a key ingredient, works by targeting stem cells in the hair bulb to signal hair follicles to enter and stay in the anagen (growth) phase.

Moderate agreement · 1 source supports

Procapil blocks DHT and enhances scalp blood circulationLimited evidenceWhat we still need: Procapil acts as a natural DHT blocker and improves blood circulation to the scalp, which is essential for delivering oxygen and nutrients to hair follicles for growth.1 source

Procapil acts as a natural DHT blocker and improves blood circulation to the scalp, which is essential for delivering oxygen and nutrients to hair follicles for growth.

Moderate agreement · 1 source supports

Baicapil and Anagain extend hair growth phase and activate dormant folliclesLimited evidenceWhat we still need: Baicapil and Anagain work to prolong the anagen (growth) phase of hair follicles and to reawaken dormant hair in the telogen phase, encouraging it to grow.1 source

Baicapil and Anagain work to prolong the anagen (growth) phase of hair follicles and to reawaken dormant hair in the telogen phase, encouraging it to grow.

Moderate agreement · 1 source supports

Product is a scalp treatment, not a hair treatmentLimited evidenceWhat we still need: The Ordinary Hair Serum is designed as a treatment for the scalp, focusing on the hair follicles, rather than a direct treatment for the hair strands themselves.1 source

The Ordinary Hair Serum is designed as a treatment for the scalp, focusing on the hair follicles, rather than a direct treatment for the hair strands themselves.

Moderate agreement · 1 source supports

It can make hair look thicker or fuller without clearly increasing true density.Limited evidenceWhat we still need: It can make hair look thicker or fuller without clearly increasing true density.1 source

It can make hair look thicker or fuller without clearly increasing true density.

Moderate agreement · 1 source supports

The serum often feels oily or heavy on the scalp and hair.Limited evidenceWhat we still need: The serum often feels oily or heavy on the scalp and hair.1 source

The serum often feels oily or heavy on the scalp and hair.

Moderate agreement · 1 source supports

The Ordinary product is described as a fuss-free formula with caffeine, glycerinLimited evidenceWhat we still need: The Ordinary product is described as a fuss-free formula with caffeine, glycerin, and peptides aimed at promoting better hair health.1 source

The Ordinary product is described as a fuss-free formula with caffeine, glycerin, and peptides aimed at promoting better hair health.

Moderate agreement · 1 source supports

Monpure Hair Density Serum is positioned above The Ordinary in at least one 2026Limited evidenceWhat we still need: Monpure Hair Density Serum is positioned above The Ordinary in at least one 2026 hair growth serum guide as the winner.1 source

Monpure Hair Density Serum is positioned above The Ordinary in at least one 2026 hair growth serum guide as the winner.

Moderate agreement · 1 source supports

Open questions

Comprehensive efficacy across diverse hair types and conditions.

Limited evidence · What we still need: Seek out additional independent reviews or clinical studies that cover a broader range of hair types and documented results.

Long-term user satisfaction and potential side effects.

Limited evidence · What we still need: More longitudinal studies or user surveys are needed to evaluate satisfaction and any unforeseen issues over extended periods.

Comparison against similar products in independent head-to-head tests.

Limited evidence · What we still need: Look for reviews that directly compare this serum to other popular multi-peptide hair growth serums to understand its relative performance.

Watch it in context

Video reviews and demonstrations that help validate the checked claims.

Source coverage and evidence history

Sources

Editorial review · 1 · Creator review · 1 · Owner reports · 1

Evidence trail

Source timeline for reference.

No evidence items yet.

Comparisons

Vegamour

Vegamour GRO Hair Serum

Consider this if you prefer a plant-based, similarly cruelty-free option with more extensive user reviews.

Kérastase

Kérastase Initialiste Advanced Scalp & Hair Serum

This is a premium alternative if you seek a luxury experience with established brand reputation.

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How this report was built

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Full editorial verdict

Based on the available, albeit limited, evidence from a single detailed revie…

Raw evidence record