Peptides vs. Retinol: Which Fits Your Skin?

In a 26-week study, a retinol cream improved fine and deeper wrinkles more than the same cream without retinol, yet three of the 57 people taking part dropped out because of irritation.⁵ If retinol has been hard on your skin too, you may be wondering whether a peptide would suit you better.

Two things decide the choice: what you'd like to change, and how comfortable your skin feels with each ingredient. If you want to improve fine lines and uneven pigmentation together, retinol has controlled findings for both.¹ If fine lines are your main concern, or retinol keeps irritating your skin, certain peptides are another way to work on wrinkles.^{2, 3}

What do retinol and peptides do in skin?

Retinol is a form of vitamin A.³ In a study of aged human skin, retinol encouraged cells in the outer layer to multiply and increased production of collagen, a protein that helps support skin, in the tissue beneath.⁴

Peptides are short chains of amino acids, the building blocks of proteins, and some of the peptides used in skincare act as signals that encourage cells to make collagen. One example is KTTKS, a short sequence found in a molecule the body uses to make collagen. In laboratory experiments, cells exposed to KTTKS produced more collagen.⁶ It's a bit like handing cells a scrap of the blueprint and having them build more of the house.

What happened when a peptide was tested against retinol?

An eight-week trial tested a serum containing cyclized Hexapeptide-9, a peptide whose chain is joined into a ring, against a retinol serum. The peptide serum produced greater improvements in several wrinkle measures by the end of the study, including the number and area of crow's feet.⁷

That trial used far less retinol than the longer studies did, though. Each serum contained 0.002% of its ingredient,⁷ compared with 0.075% retinol in the 26-week study⁵ and 0.1% in a year-long retinol study described in the next section.¹ So the trial can't tell you how this peptide would compare with those stronger retinol formulas.⁷ The paper's title says the peptide "outperforms retinol," which holds for the retinol it tested. Comparing at that strength is a bit like judging coffee brewed at a fraction of its usual strength.

What has each been shown to do on its own?

Retinol and peptides have each been studied separately, in trials with different formulas. The year-long study tested a stabilized 0.1% retinol formula and found improvements in crow's-feet fine lines and uneven pigmentation.¹ Both retinol studies followed people for months, and the year-long one found continued improvement with prolonged use.^{1, 5} So give retinol time. How your skin feels in the first few applications is worth knowing, but judging changes in lines and tone takes longer.

For peptides, the evidence comes from Palmitoyl Pentapeptide-4, a modified version of KTTKS and a different peptide from the one tested against retinol. In a twelve-week trial, women used a moisturizer with the peptide on one side of the face and the same moisturizer without it on the other. Fine lines and wrinkles improved more on the peptide side, and because both sides got the same base, the difference shows what adding the peptide contributed.²

What if retinol irritates your skin?

Retinol can cause dryness and irritation,³ and irritation is what made people drop out of the 26-week study.⁵

If you're new to retinol, introduce it gradually. The American Academy of Dermatology recommends starting with a low-strength retinoid, using it less frequently at first, and including moisturizer. (Retinoids are the family of vitamin A ingredients that includes retinol.) Retinol belongs in a nighttime routine, with sun protection during the day. Avoid retinol during pregnancy.^{8, 3}

If retinol keeps leaving your skin uncomfortable, peptides are worth considering for wrinkle care. The Palmitoyl Pentapeptide-4 moisturizer from the twelve-week trial was reported to be well tolerated.² Before putting any new peptide product on your face, test it on a small area, because even products labeled hypoallergenic can cause a reaction.⁸

If a cosmetic product burns or stings, stop using it and allow the reaction to settle, and seek a dermatologist's advice if it persists. For a prescribed treatment, check with the prescriber about the reaction.⁸

Would using peptides and retinol together improve results?

Some skincare products combine peptides and retinol. One study followed people using a serum that contained retinol, peptides, another vitamin A ingredient and an antioxidant. Their wrinkles improved during use, but the study had no retinol-only comparison, so the combination's added benefit is still uncertain.⁹

If retinol is already working for you and your skin's comfortable with it, you can keep using it on its own. If you'd like to try the pair, the Field Notes guide to using peptides with retinol explains how to introduce them and where they fit in a routine.

How should you choose between retinol and peptides?

1. Start with what you want to change. If you're noticing both lines around your eyes and patchy pigmentation, retinol has controlled findings for both.¹ If fine lines are your main concern, the peptide studies in this article give you another option to consider.²
2. Consider your experience with retinol. If it's working well for you, that's a reason to keep it. If it keeps irritating your skin, consider another approach, and peptides are one option. If your skin is irritated right now, let it settle before you try another active product.^{3, 8}
3. Make one change at a time. Introducing several anti-aging products together can irritate skin.⁸ Start with one, see how comfortable it feels, and allow time to judge its results before deciding whether to add another.

You might end up trying retinol, choosing a particular peptide, or keeping what already works, and any of those is a reasonable outcome.

Sources

1. Randhawa M, et al. One-year topical stabilized retinol treatment improves photodamaged skin in a double-blind, vehicle-controlled trial. Journal of Drugs in Dermatology, 2015.
2. Robinson LR, et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. International Journal of Cosmetic Science, 2005.
3. American Academy of Dermatology. Retinoid or retinol?
4. Shao Y, et al. Molecular basis of retinol anti-ageing properties in naturally aged human skin in vivo. International Journal of Cosmetic Science, 2017.
5. Kikuchi K, et al. Improvement of photoaged facial skin in middle-aged Japanese females by topical retinol (vitamin A alcohol): a vehicle-controlled, double-blind study. Journal of Dermatological Treatment, 2009.
6. Katayama K, et al. A pentapeptide from type I procollagen promotes extracellular matrix production. Journal of Biological Chemistry, 1993.
7. Chang H, et al. Novel Cyclized Hexapeptide-9 Outperforms Retinol Against Skin Aging: A Randomized, Double-Blinded, Active- and Vehicle-Controlled Clinical Trial. Journal of Cosmetic Dermatology, 2025.
8. American Academy of Dermatology. How to maximize results from anti-aging skin care products.
9. Shen Y, et al. An Innovative Serum With Retinol, Hydroxypinacolone Retinoate, Peptides, and Silybin Improves Mild Photoaged Facial Skin in Middle-Aged Chinese Women. Journal of Cosmetic Dermatology, 2026.