The Ordinary Multi-Peptide Serum for Hair Density

RESEARCH

Caffeine may slow hair loss
Pea extract boosts hair genes
Limited direct evidence

COMMUNITY

Delivers fuller-looking hair
Headaches in some users
Results after 6+ months

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SAFETYSome users report headaches, dizziness, or light sensitivity; start with a small amount and discontinue if neurological symptoms occur.

WHAT THE RESEARCH SAYS

ALL 21 ON PUBMED ↗

BASED ON 21 PUBMED STUDIES

Cards marked "FROM INGREDIENT LIST" below are separate PubMed searches on The Ordinary Multi-Peptide Serum for Hair Density's individual key ingredients, not the product itself — PubMed rarely indexes research on a specific commercial product by name.

FROM INGREDIENT LISTREVIEW⚠ THE SYSTEMATIC REVIEW EXPLICITLY STATES SAFETY AND EFFICACY REMAIN UNCLEAR DESPITE PROPOSED MECHANISMS.

Caffeine — Caffeine may help with hair loss through cellular mechanisms, but evidence for actual effectiveness remains unclear.

view on pubmed ↗

SYSTEMATIC REVIEW⚠ MOST STUDIES FOCUSED ON CAFFEINE ALONE; MIXED STUDY QUALITY AND SMALL SAMPLE SIZES IN INDIVIDUAL TRIALS.

Caffeine may help prevent hair loss and support growth.

view on pubmed ↗

SMALL PILOT STUDYPUBLISHED 2020⚠ VERY SMALL SAMPLE SIZES (10–21 VOLUNTEERS); SHORT DURATION; NO LONG-TERM FOLLOW-UP DATA ON CLINICAL HAIR DENSITY OUTCOMES.

Pea sprout extract may boost hair-growth genes and increase hair density.

view on pubmed ↗

RANDOMIZED CONTROLLED TRIALPUBLISHED 2022⚠ STUDY USED A COMBINATION OF MULTIPLE INGREDIENTS, SO INDIVIDUAL CONTRIBUTION OF EACH COMPONENT (INCLUDING CAFFEINE) UNCLEAR; SELF-REPORTED THINNING BASELINE RATHER THAN CLINICAL DIAGNOSIS.

Combination of caffeine with other ingredients may improve hair retention and scalp health.

view on pubmed ↗

WHAT PEOPLE SAY

READ THREADS ON REDDIT ↗

COMMUNITY SENTIMENT

55% positive

“Ordinary density serum isn’t even a hair growth serum it’s for fuller *looking* hair. Not fuller hair …there is a notable difference”

U/[DELETED] ↗

“For the record, even if this video is fake, I have been using their hair serum for about 6 months (I have extremely thin and fine hair) and the density has definitely increased. The product isn't a scam, even if the stupid tiktokers are making it look like one.”

U/LINTHETRASHBIN ↗

“I tried it but it gave me intense headaches especially if I rubbed it in..and I’m not a person that gets headaches at all. I found that I could only use a tiny amount of it. I ended up returning it. I also went on Reddit when I was having my symptoms and saw it was not uncommon. Lightheadedness, dizziness and light sensitivity too. Something about the peptide formulation. I switched to Cecred and it works really well for me. Not everyone gets these neurological symptoms with the ordinary though and they have great results. I don’t notice excessive build up but I am a 1-2x/week washer.”

U/GENTLYNAVIGATING ↗

COMMENTS

Add context that might help others — skin type, conditions like PCOS, what you'd tried before. The more specific, the more useful.

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