The Ordinary Multi-Peptide Serum for Hair Density

RESEARCH

No direct studies on this product
Key ingredients: mixed evidence

COMMUNITY

Mixed results reported
Headaches common side effect
Fuller-looking, not actual growth

⚠

SAFETYSome users report headaches, dizziness, and light sensitivity; start with minimal amounts if you have caffeine sensitivity.

WHAT THE RESEARCH SAYS

ALL 7 ON PUBMED ↗

BASED ON 7 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 ABSTRACT DOESN'T REPORT ITS ACTUAL FINDINGS OR CONCLUSIONS ABOUT EFFICACY.

Caffeine — Caffeine may help with hair growth based on how it works in cells, but there's not enough solid evidence that it actually works in real people.

view on pubmed ↗

FROM INGREDIENT LISTRANDOMIZED CONTROLLED TRIAL⚠ SMALL SAMPLE SIZE (N=32) AND THE INGREDIENT WAS TESTED AS PART OF A MULTI-INGREDIENT COMBINATION, NOT IN ISOLATION.

Acetyl Tetrapeptide-3 — A combination product containing this peptide worked about as well as minoxidil for hair loss in a small trial.

view on pubmed ↗

WHAT PEOPLE SAY

READ THREADS ON REDDIT ↗

COMMUNITY SENTIMENT

48% 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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