Rhode Barrier Restore Cream: Four Peptides in a Row, Three With No Published Study

Barrier Restore Cream is Rhode's daily moisturiser, sold as the last step after the brand's essence and Peptide Glazing Fluid. Rhode counts "peptides" among the cream's key ingredients without naming them; the published list does name them, four in all. Below, each name is looked up in PubMed and PubChem, and the cream's barrier positioning is checked against what the list contains. Nobody here has used the cream, and nothing below describes how it performs.

The declaration

Copied from rhodeskin.com (US), read on 4 October 2026.

Finding 1: four peptides, in one block, directly above the preservative

The list declares four peptides, consecutively, at positions 10 to 13. The next entry, at 14, is phenoxyethanol, a preservative capped at 1% in EU cosmetics. US labelling law (21 CFR 701.3(f)(2)) frees anything at 1% or less from descending order, so sitting just above the preservative does not reveal the peptides' level in either direction.

Rhode publishes no amounts, so the block's place on the list is all a shopper has to go on. The page itself names them only as "PEPTIDES" in its "also made with" line.

Finding 2: three of the four have no published study under their names

We searched PubMed for each name as a quoted phrase on 4 October 2026 and read PubMed's own "phrase not found" warning for each, then checked PubChem for a compound record.

The search worked as a control: the same method returned records for acetyl tetrapeptide-2, and returns 44 for the Argireline peptide in Rhode's Glazing Fluid. A missing record is not proof that no data exist — ingredient suppliers often hold unpublished studies — but no study under these three names is in the public literature, and the product page cites none.

The two acetyl tetrapeptide-2 papers:

• Kobiela 2018 (PMID 30416406) treated immortalised human keratinocytes with acetyl tetrapeptide-2 and measured cell stiffness by atomic force microscopy. It found the cells stiffened across the concentrations tested. The study, co-authored by a cosmetics company's research centre, involved no people.
• Turlier 2021 (PMID 34668237, NCT04652232), run by Pierre Fabre, randomised 100 women with acute telogen effluvium — temporary hair shedding — to a scalp lotion plus shampoo or shampoo alone. The lotion contained creatine, acetyl tetrapeptide-2 and B vitamins, so the peptide's share of any effect cannot be separated, and the study was open-label. Hair shedding fell more at week 8 in the lotion group.

Neither tested facial skin, a moisturiser, or a barrier measure such as water loss. The peptide's sequence and both papers are set out in our acetyl tetrapeptide-2 entry.

Finding 3: a barrier cream with no ceramide

The skin barrier is built largely from lipids — ceramides, cholesterol and free fatty acids. This list declares no ceramide. How the trial evidence for ceramides and for peptides divides is counted on peptides vs ceramides. Rhode's page puts a "Ceramide Trio" in a different product, Glazing Milk. The cream's barrier-type ingredients are glycerin (2nd), a humectant; caprylic/capric triglyceride (3rd), shea butter (4th) and squalane (8th), emollient lipids; and niacinamide (7th). Its stated benefits are that it "comforts and soothes the skin barrier" and "helps improve skin dullness" — appearance and feel, not a measured barrier outcome.

Finding 4: teprenone is not a peptide

Teprenone, 24th, sits among the actives but is geranylgeranylacetone (C23H38O, PubChem CID 5282199), a small isoprenoid with no amino acids. PubMed holds 439 records under "teprenone". Under its chemical name and skin, there are four: three cell studies and one mouse study (Jin 2023, PMID 37760004), which reported that it reduced skin inflammation in mice more effectively when taken orally than when applied topically.

The 95%, 89% and 83%

The cream's page prints three percentages: 95% "agreed it worked well in their skincare regimen (even before SPF)", 89% that it "provided enough moisturization", and 83% that their "skin looked healthier". A footnote gives the base: 46 people, 30 days, a consumer perception study. None of the three is a reading from a corneometer, a water-loss probe or any other instrument, and no second cream was tested beside it, so the figures describe how users felt about the product rather than a change in their barrier. Rhode's Peptide Glazing Fluid and Peptide Lip Treatment pages rely on the same study type.

Application is directed to "face, neck, and décolleté". The single-peptide trials this site has counted were all run on facial skin (the census is here), and dedicated neck products are read on our peptide neck cream page.

What it costs

Listed on 4 October 2026: $32 for 1.7 oz (about $18.82 per ounce) and $20 for 1.0 oz.

Still unknown

Three things the published record cannot settle: the amount of each of the four peptides; what the ingredient suppliers' own data on palmitoyl heptapeptide-27, palmitoyl oligopeptide-78 and palmitoyl octapeptide-24 contain; and whether the cream moves water loss or any other barrier measurement, since no study of the product is published.

Further reading

For moisturisers as a category, see our peptide moisturizer guide and what peptides do for skin. For how to read a list like this one, see how to read a peptide ingredient list. Another barrier-positioned peptide cream read the same way: Skinfix Barrier+ Triple Lipid-Peptide Cream.

Sources

• Rhode, Barrier Restore Cream product page and product JSON: ingredient list, key-ingredient text, consumer-study figures and prices, rhodeskin.com, read 4 October 2026.
• PubMed E-utilities, 4 October 2026, quoted-phrase searches with the quotedphrasesnotfound field read: "acetyl tetrapeptide-2" (2); "palmitoyl heptapeptide-27", "palmitoyl oligopeptide-78", "palmitoyl octapeptide-24" (each not found); "acetyl hexapeptide-8" OR argireline (44, control); teprenone (439); geranylgeranylacetone AND skin (4).
• PubChem name lookups, 4 October 2026: acetyl tetrapeptide-2 (CID 91936905); teprenone (CID 5282199); the three palmitoyl peptides (no CID found).
• Kobiela T et al. The effect of anti-aging peptides on mechanical and biological properties of HaCaT keratinocytes. International Journal of Peptide Research and Therapeutics 2018 (PMID 30416406).
• Turlier V et al. Assessment of the effects of a hair lotion in women with acute telogen effluvium: a randomized controlled study. Journal of the European Academy of Dermatology and Venereology 2021 (PMID 34668237; NCT04652232).
• Jin T et al. Geranylgeranylacetone ameliorates skin inflammation by regulating and inducing thioredoxin. Antioxidants 2023 (PMID 37760004).
• US Code of Federal Regulations, 21 CFR 701.3(f)(2) — the any-order rule for ingredients present at 1% or less, which limits what list position can tell a reader about this cream's peptide content.