Drunk Elephant Protini Polypeptide Cream: What the Nine Peptides on the Label Actually Are

Protini is the cream that made "peptide moisturizer" a mainstream shelf category, and its name searches run to more than eleven thousand a month. The brand's headline claim is a count: "nine signal peptides." The full ingredient list is published on Drunk Elephant's own product page, so the count can be checked. This analysis reads the list position by position, identifies each of the nine, and sets the product page's claims beside what has been published. No one here has used Protini, so nothing below is a report of how it performs.

The declaration

The list below is copied from drunkelephant.com (US), read on 3 October 2026. Positions were counted by hand; 1,2-Hexanediol and each slash-joined name (for example Lactic Acid/Glycolic Acid Copolymer) count as one ingredient.

Finding 1: the nine are three different kinds of ingredient

The product page says "nine signal peptides (made up of amino acids, which form proteins in the skin) bind moisture to skin". The list does carry nine peptide-class ingredients, in one block at positions 10 to 18. Read by identity, they fall into three groups.

The zero for positions 15 and 16 needs one caveat, because it is easy to get wrong: PubMed reported that it could not match either quoted name, and an unmatched phrase makes PubMed search the words separately and return a large, meaningless number. The true count under both names is zero. (The same check on a known ingredient, retinol with skin and the randomized-trial filter, returned 66, so the search itself was working.)

Finding 2: five of the nine are growth factors, and they are proteins

The sh- prefix in an ingredient name designates a protein made to a human sequence by recombinant expression — the same convention behind the collagen ingredient read on our COSRX eye patch analysis. Ingredient databases identify Protini's five as follows; the chain lengths are the mature human proteins in UniProt.

Chemistry usually reserves peptide for chains of up to about fifty amino acids. All five are at or beyond that line — even "oligopeptide-1", whose name suggests a short chain, is a 53-residue protein. For comparison, the copper peptide most shoppers have heard of, copper tripeptide-1, is three amino acids. The size matters for one practical reason that our sh-oligopeptide-1 page sets out in detail: molecules of several thousand daltons are far above the size usually thought able to cross intact skin, and a 2023 review of the cosmetic EGF ingredient questioned whether it is a functional growth factor at all.

The combination of these five particular factors matches the composition that ingredient references attribute to a supplier blend sold for cosmetics. The brand's founder, in the note on the product page, describes them as "safe, synthetic growth factors". The brand's FAQ, a few lines further down, says Protini "contains plant-derived peptides". Those statements can both be true — recombinant proteins are sometimes grown in plants — but the label cannot confirm the source either way, and the page does not name it.

What the wider literature holds: PubMed returned 13 records tagged as randomized controlled trials on 3 October 2026 for growth factors with a topical or cosmetic term and a wrinkle or photoaging term, against 66 for retinol and skin under the same filter. Read by title, only about five test a growth-factor preparation as the intervention — among them a 2026 pilot comparing synthetic with human-derived EGF, a human fibroblast-derived product, and transforming growth factor beta-1 with vitamin C. The rest mention growth factors in passing. None tests Protini or the five-factor set on its label.

Finding 3: two peptides travel in a capsule, and the capsule is on the label too

Copper palmitoyl heptapeptide-14 and heptapeptide-15 palmitate are described by ingredient references as the two peptides of an encapsulated copper-peptide technology: the first is the payload, the second a targeting peptide on the outside of a polymer shell. That shell is built from polyvinyl alcohol and a lactic acid/glycolic acid copolymer — and both are declared, at positions 38 and 46, far down the list from the peptides they carry. Reading the list as a set of systems rather than single ingredients is the only way the bottom half makes sense.

Calling the targeting peptide a "signal peptide" is the brand's wording; its described job is delivery. Neither name returns a PubMed record, so the claims for this system rest on supplier information rather than published trials. The broader evidence on copper peptides — including the one indexed randomized trial on skin, which was negative on its objective measures — is on our copper peptides page.

Finding 4: the last two are the Matrixyl 3000 pair

Palmitoyl tetrapeptide-7 and palmitoyl tripeptide-1 are the two peptides sold together as Matrixyl 3000. Our Matrixyl page explains why that name covers three different products, and that the most-cited randomized trial — 93 women, 12 weeks, 3 parts per million — tested a different peptide, palmitoyl pentapeptide-4, not this pair. On 3 October 2026 PubMed returned two records naming both ingredients, both published in September 2026 and neither a clinical trial: a stratum-corneum permeation study of cosmetic actives and a computer-docking screen of peptide ingredients. Our Matrixyl page's earlier search found one multi-ingredient eye-cream study by the supplier; no randomized wrinkle trial isolating the pair has been found. Each has its own page: palmitoyl tetrapeptide-7 and palmitoyl tripeptide-1.

Finding 5: position is not amount

All nine peptides sit above the ten amino acids (positions 19–28, listed in alphabetical order) and above sodium hyaluronate (32). That does not mean they are present in large amounts. US rules require descending order only down to the 1% line; ingredients at 1% or less may be listed in any order (21 CFR 701.3(f)(2)). The alphabetical run of amino acids suggests an ingredient group added together rather than ten independently weighed amounts, but the label gives no figure for any of the nine peptides, and growth factors and signal peptides are normally supplied at parts-per-million levels. Our guide to reading a peptide ingredient list explains the rule.

What the product page claims, beside what it shows

The 31-person figures describe the share of people who "showed improvement", with no comparison group, no method and no citation. A cream with no peptides at all can improve hydration in most of a small group; without a comparator, the study cannot separate the peptides from moisturizing in general. PubMed returned no record for "Protini" on 3 October 2026.

Price

Listed on 3 October 2026: $72 for 50 mL ($1.44 per mL), $99 for 100 mL ($0.99 per mL), $24 for 15 mL, and $63 for a 50 mL refill.

What this analysis cannot establish

• How much of any peptide or growth factor is in the jar. The brand does not publish amounts.
• Whether the growth-factor proteins reach living skin cells from a cream. No study of this formula addresses it.
• How the 8-week study was run. Without a design or a publication, its percentages cannot be weighed.

Where to go next

For what the peptide classes in this cream are designed to do, see what peptides do for skin and the evidence-ranked list on peptides for skin. Other moisturizers read the same way: Naturium Multi-Peptide Moisturizer and Olay Regenerist Micro-Sculpting Cream. Our peptide moisturizer guide covers the category.

Sources

• Drunk Elephant, Protini Polypeptide Firming Refillable Moisturizer product page, ingredient list, claims, FAQ and prices, drunkelephant.com, read 3 October 2026.
• UniProt entries P01133 (EGF), P05019 (IGF-1), P09038 (FGF2), P05230 (FGF1), P15692 (VEGF-A), read 3 October 2026.
• PubMed E-utilities searches, 3 October 2026: "Protini" (0); sh-oligopeptide-1 (3); palmitoyl tripeptide-1 with palmitoyl tetrapeptide-7 (2, PMIDs 42790608 and 42683869); copper palmitoyl heptapeptide-14 and heptapeptide-15 palmitate (quoted phrases not found; 0); topical or cosmetic growth factors with wrinkle or photoaging terms, "randomized controlled trial"[pt] (13, read by title); retinol and skin control (66).
• INCIDecoder ingredient entries for sh-polypeptide-1, -9, -11, sh-oligopeptide-2, copper palmitoyl heptapeptide-14 and heptapeptide-15 palmitate, read 3 October 2026.
• US Code of Federal Regulations, 21 CFR 701.3(f)(2), ingredient order at or below 1%.