The Ordinary Multi-Peptide Serum vs Tara: An Honest Comparison
The Ordinary’s Multi-Peptide Serum for Hair Density is the benchmark ‘multi-peptide’ serum. Tara’s Follicle-Stimulating Scalp Serum plays the same game — same hero peptide, different philosophy. Here is the honest, label-by-label comparison, including where our own serum’s claims are capped by the evidence.
Both serums are built on Capixyl (acetyl tetrapeptide-3 + red clover). So the question isn’t ‘which has peptides’ — it’s what each brand is willing to tell you about them.
Side by side
| The Ordinary Multi-Peptide | Tara Follicle-Stimulating | |
|---|---|---|
| Hero peptide | Capixyl (acetyl tetrapeptide-3 + red clover) | Capixyl — the same peptide. Parity. |
| Active count | Five trademarked complexes (REDENSYL, Procapil, Capixyl, Baicapil, AnaGain) + caffeine. | Capixyl + onion extract for microcirculation. Fewer, deliberately. |
| States a working dose? | No — zero percentages disclosed. | No published % either — but every claim is held to the dose-gate (below). |
| Evidence shown? | None on the page. | A public, Scopus-counted evidence table — each claim has a study. |
| Claim ceiling | ‘Fuller, denser-looking hair’ — a cosmetic appearance claim. | Density support, honestly bounded — we don’t borrow the onion 87% myth. |
| Says what it does NOT do? | No. | Yes — onion is microcirculation, not regrowth; keratin rinses out. |
A label is not a dose
The one number neither bottle prints is the one that decides whether a peptide works: its concentration. Capixyl’s own manufacturer data uses a 3–5% range; below 3% it is ‘peptide-supported’, not proven. The Ordinary lists five trademarked complexes and not a single percentage — a long ingredient list is marketing, not a dose. We hold our serum to the same gate: we claim what the dose supports, and we say ‘peptide-supported’ when that is the honest word.
Where the gate cuts against us
Honesty has to run both ways. Our onion is an extract — not the crude juice of the famous study where 87% regrew hair, and that study was on alopecia areata, a different disease. So we don’t claim the number. Hydrolyzed keratin in a rinse-through step washes away. We’d rather tell you that than sell you the myth.
So which serum?
If you want the longest list of trademarked complexes, The Ordinary has more. If you want actives graded against published studies, dosed honestly, and a brand that tells you what doesn’t work — that is the difference. Neither of us prints the Capixyl %, so ask both. The difference is we’ll answer.
See the Follicle-Stimulating Scalp Serum, the evidence table, or how rosemary compares to minoxidil.
Related
which hair ingredients actually work · do hair vitamins work? · UAE hair-loss data.
Competitor facts from theordinary.com (Multi-Peptide Serum for Hair Density), accessed June 2026. Capixyl dose range per the manufacturer (Lucas Meyer) technical data. Tara actives per the product label.