The research behind our Retinol Alternative Eye Serum

Why retinol and the eye area rarely mix, what each ingredient in our eye serum does, what 20 women reported after 8 weeks, and what none of it proves.

Every ingredient discussed here is in the eye serum. The studies tested ingredients at stated strengths, usually in other products, and we say so each time.

Ask anyone who uses retinol where they don't put it, and most will point to their eyes. That's the problem this eye serum exists to solve: the place where fine lines show first is the place retinol is hardest to use.

This guide goes through every active ingredient in our Retinol Alternative Eye Serum, what the research behind each one found, what it doesn't prove, and what 20 women reported after eight weeks with the finished formula. If you only want the product, the eye serum page has everything in one place.

01Why retinol and the eye area rarely mix

The skin around the eyes is among the thinnest on the body, has fewer oil glands and moves constantly. Retinol's familiar side effects, dryness, flaking, redness and stinging, tend to be at their worst there. Many dermatologists advise keeping standard retinol products a little away from the eye area, and many users give up on the eye area altogether.

That leaves a gap. Crow's feet and fine, crêpey lines under the eyes are often the first signs of ageing people notice, and they're exactly where a gentle, twice-daily product is needed. Retinol eye creams exist, usually at lower strengths, but plenty of people still find them too much.

Since November 2025, new face products sold in the EU are also limited to 0.3% retinol equivalent. That's sensible, and it means even strong retinol options are now gentler than they used to be.

02What is a retinol alternative eye serum?

It's an eye product that carries an ingredient chosen to work on the same pathways as retinol, without being vitamin A. Ours uses 2% Bidens Pilosa extract, from a wild herb in the daisy family, in a silky serum built around hydration: aloe, glycerin, sodium PCA and two forms of hyaluronic acid, with horse chestnut extract, borage and jojoba oils.

Because it isn't a retinoid, there's no adjustment period and no need to save it for evenings. You can use it morning and night from the first day, which matters more than strength: consistency is what changes skin.

03Retinol eye cream vs retinol alternative eye serum

Retinol still wins on evidence. If your eye area tolerates it, it's a strong choice, and our retinol guide explains how to use it well. This serum is for everyone else.

04How we rate the evidence

05Bidens Pilosa, in depth

Bidens Pilosa, also called Black Jack, is a wild herb from the daisy family. Its extract contains phytol, which the body can convert into phytanic acid, a compound known to act on RXR receptors, one of the two receptor families retinoids work through.

06Hyaluronic acid around the eye

This is one of the most relevant studies in the whole guide, because it was done exactly where you'll use this serum.

07Horse chestnut and escin

We go into horse chestnut and escin in more depth in the research behind our Smoothing Eye Cream, where it's the hero ingredient.

08Borage, jojoba and castor oils

Borage seed oil is one of the richest plant sources of gamma-linolenic acid, a fatty acid involved in the skin barrier. A 2017 review of plant oils applied to the skin (Lin, Zhong and Santiago) describes borage oil's anti-inflammatory and barrier-supporting properties across the studies it collected. It's a review of small studies, not a trial of our serum.

Jojoba, sixth on the list and organic, is a liquid wax close to the skin's own oils (Pazyar et al., 2013, a review). Castor seed oil gives the serum its slip and a cushioned feel. Together they keep the eye area comfortable without heaviness.

09Aloe and glycerin

Aloe is the first ingredient, so it's the largest single part of the formula. In a two-week study of 20 women (Dal'Belo et al., 2006), creams containing freeze-dried aloe raised the water content of the skin's outer layer. Glycerin, second on the list and made using organic ingredients, is one of the best-evidenced humectants there is; a 2008 review (Fluhr, Darlenski and Surber) summarised its benefits for hydration and barrier function.

Both are covered in more depth in the research behind our serum.

10Sodium PCA

PCA is the largest single part of the skin's natural moisturising factor. A 1981 review (Clar and Fourtanier) found creams with at least 2% PCA or PCA salt improved dry skin. Sodium PCA is seventh in our formula, fairly high for an active. It's an older review, much of it the authors' own work, and our percentage isn't published. There's more in the research behind our moisturiser.

11The supporting actives

A marine sugar (exopolysaccharide) that forms a light film on the skin. In a 2017 study by its makers (Borel, Lamarque and Loing, Journal of Cosmetic Science), it reduced UV-linked damage to cell fats in the lab and, at 0.02%, cut the number of fine particles sticking to volunteers' skin by 45% against placebo. We don't know if our grade is the one tested.

An oil-soluble form of hydroxyproline, an amino acid found in skin, 12th in our formula. Its maker reports firmer-looking skin and fewer visible wrinkles, but hasn't published the study details, and we found no independent peer-reviewed trial. Promising, not proven.

12The light-reflecting pigment

The formula contains CI 77163, bismuth oxychloride, a pure mineral pigment that reflects light. It gives the serum a soft, luminous finish and helps the eye area look brighter and smoother straight away.

We want to be clear about that, because it matters when you read the testing results. Some of the instant visible improvement people report, and some of the brighter look around dark circles, is optical: light bouncing off the skin. That's a genuine cosmetic benefit, and it isn't a change in the skin itself. The hydration and smoothness people noticed over eight weeks are a different, slower effect.

13Testing on this exact formula

Everything above tests single ingredients. The only results for our finished eye serum come from consumer-perception testing: 20 women used it for 8 weeks and rated their own skin.

Read the pattern. Smoothness and hydration scored highest, which fits the strong evidence for the hydrators. Lines and dark spots scored lowest, which fits the lab-only evidence for Bidens Pilosa and the fact that pigment changes slowly.

14Dark circles and bags, honestly

90% of testers saw their dark circles look less visible and 85% saw under-eye bags look less visible. Those are real perceptions, and we publish them. We also want you to know what's behind them.

Dark circles come from pigment in the skin, blood vessels showing through thin skin, or shadows from the shape of the eye area. Bags usually come from fluid collecting overnight or from the structure of the lower lid. A light-reflecting finish and better hydration make the area look fresher. No cream removes pigment, fluid or structure, and we don't claim this one does. Sleep, daily SPF, treating allergies and, frankly, concealer help too.

15How to choose an eye serum

16How to use it

Tap the serum along the bone around each eye with your ring finger, keeping away from the lids and lash line. Follow with our Smoothing Eye Cream if you want extra hydration, and our Retinol Alternative Serum and Moisturiser for the rest of your face. A 15 ml bottle lasts around two to three months used twice a day.

Not sure whether you need the serum, the cream or both? Our eye cream or eye serum guide answers that in a few minutes.

17Who it suits

It suits you if retinol was too harsh for your eye area; you want a retinol alternative you can use morning and night; your eyes look tired, dry or creased by the end of the day; or you want every ingredient named before you buy.

Skip it, or check first, if you need a fragrance-free eye product; you react to ragweed, daisies or chamomile; your eyes are suddenly swollen, itchy or red; you're pregnant or breastfeeding and haven't asked your doctor; or you want the best-evidenced option regardless of comfort, which is retinol. For the plant alternative with human trial data, see bakuchiol vs Bidens Pilosa.

18What it adds up to

This eye serum puts a retinol alternative where retinol is hardest to use. Its hydration evidence was gathered around the eye itself, the finished formula was rated well by 20 women over eight weeks, and we've told you which parts of that result are optical and which are about the skin.

If you want a gentle, twice-daily eye product with a plant retinol alternative and every ingredient on show, this is the one we'd point you to.

19Your questions, answered

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