Which Skincare Combinations Actually Work

The skincare industry has spent a decade convincing consumers that complexity equals efficacy. Layer your vitamin C serum before your hyaluronic acid, follow with niacinamide, finish with SPF — and that is just the morning routine. Yet an analysis of 244 skincare products across seven ingredient categories reveals a finding that cuts against the grain of this received wisdom: single-active products outperform their multi-active counterparts, achieving an average effectiveness score of 67.3 compared with 66.0 for products containing two or more active ingredients.

The gap may appear modest — 1.3 percentage points — but it is consistent. Across overall scores, which incorporate ingredient quality, skin compatibility, texture, and value, single-active products again lead: 67.8 versus 66.1. In a market where brands routinely charge a premium for complexity, this data suggests the premium is largely unjustified.

The findings emerge from an assessment of 244 products spanning face moisturisers, cleansers, hyaluronic acid serums, SPF and sunscreens, retinol and retinoids, vitamin C serums, and niacinamide serums. Products were scored across five criteria — effectiveness, ingredient quality, skin compatibility, texture and experience, and value for money — and aggregated into overall and effectiveness sub-scores. A further 31 products carried no identifiable active ingredient and were excluded from the single-versus-multi comparison.

The headline result for category performance is equally counterintuitive: face moisturisers, the most ordinary of skincare products, top the effectiveness rankings at 73.3, a full 11.2 points above niacinamide serums at the bottom of the table at 62.1. The serums that dominate social media skincare discourse — vitamin C, retinol, niacinamide — consistently underperform the humble moisturiser when measured against the same rubric.

The effectiveness rankings across the seven categories analysed present a clear hierarchy, and it is not the one that skincare content creators would have you expect. Face moisturisers lead at 73.3 out of 100 across 39 products. Cleansers follow at 71.4 across 30 products. Hyaluronic acid serums rank third at 68.8 across 31 products, and SPF products sit at 68.1 across 31 products.

The gap widens sharply after that. Retinol and retinoids — the active ingredient most consistently supported by clinical dermatological research for anti-ageing and skin texture — score only 63.7 across 42 products, the second-largest category in the dataset. Vitamin C serums, which command some of the highest price points in the market, average 63.5 across 39 products. Niacinamide serums bring up the rear at 62.1 across 32 products.

The disparity between moisturisers (73.3) and the active-ingredient serums (ranging from 62.1 to 68.8) is partly explained by what effectiveness measures capture. A product that repairs and reinforces the skin barrier — as a well-formulated ceramide or hyaluronic acid moisturiser does — delivers results that are consistent, visible, and low-risk. Active serums, particularly retinoids and vitamin C, are more potent in theory but generate more variable outcomes: irritation, purging, and concentration-dependent efficacy all compress average scores across a diverse product field.

The best-performing individual product by overall score is the MAELOVE Vitamin C Serum at £40, achieving an overall score of 85 and an effectiveness score of 83 — well above the 63.5 category average, suggesting that within the vitamin C serum category, quality distribution is highly skewed. At the other end of the value spectrum, The Ordinary Niacinamide 10% + Zinc 1% at £5 scores 84 overall with an effectiveness score of 83, surpassing the category average by more than 20 points.

The single-versus-multi-active question is, in many respects, the central debate of modern skincare. The Ordinary built a £300 million business on the premise that single-ingredient products at clinical concentrations represent better science and better value than complex blends. Their philosophy has been widely imitated. Yet simultaneously, brands continue to launch products stacking three, four, or five actives into a single formula, arguing that synergistic benefits outweigh any dilution of individual ingredients.

The data from this analysis supports The Ordinary's position, at least on aggregate. 97 single-active products average 67.3 for effectiveness and 67.8 overall. The 116 multi-active products average 66.0 for effectiveness and 66.1 overall. The multi-active category is actually larger in this dataset — more products feature ingredient combinations than single actives — yet they underperform consistently.

There are, however, important exceptions. The top-ranked multi-active product by overall score is the MAELOVE Vitamin C Serum (overall: 85, effectiveness: 83), which combines vitamin C, vitamin E, ferulic acid, and hyaluronic acid. This is not a random stack: the combination of vitamin C with vitamin E and ferulic acid is one of the best-evidenced synergies in skincare chemistry, with ferulic acid stabilising the notoriously unstable vitamin C molecule and extending its antioxidant activity. The MAELOVE formulation reflects genuine biochemical logic, and its score reflects that.

Similarly, the CeraVe Moisturising Cream (overall: 83, effectiveness: 83, £13.11) combines hyaluronic acid with ceramides — two ingredients with complementary mechanisms: hyaluronic acid attracts and holds water in the skin, while ceramides lock in moisture by reinforcing the lipid barrier. The combination works because the ingredients operate at different structural levels rather than competing for the same biochemical pathway.

The underperformers in the multi-active set tend to be those stacking incompatible concentrations or using complexity as a marketing signal rather than a formulation rationale. The lesson from the data: combinations can work, but they must be purposeful.

One of the more striking patterns in the dataset is the absence of a reliable relationship between price and performance. The highest overall score in the entire analysis — 85 — belongs to the MAELOVE Vitamin C Serum at £40. The second-highest overall score — 84 — belongs to The Ordinary Niacinamide 10% + Zinc 1% at £5. These two products are separated by £35 and a single overall point.

At the category level, the best SPF product — Piz Buin Allergy Sun Sensitive Skin Face Cream SPF50+ — costs £8.50 and achieves an effectiveness score of 84, placing it among the top performers in the entire dataset. The best cleanser, La Roche-Posay Effaclar Purifying Foaming Gel at £13.19, scores 83 for effectiveness and 80 overall. Neither brand occupies the luxury tier; both represent the functional, dermatologist-adjacent mid-market that appears to offer the best return on investment.

The outlier in the value analysis is Medik8 Hydr8 B5 Intense, priced at £60. Its overall score of 82 and effectiveness score of 82 are strong, but nearly matched by the £16 travel-size version of the same product, which scores 80 overall and 82 for effectiveness. Two points and £44 separate the two SKUs — a poor return on the price increase.

CeraVe's Moisturising Cream warrants particular attention in any value discussion. At £13.11 for 454g, it achieves an overall score of 83 and an effectiveness score of 83 — placing it above the category average for face moisturisers (73.3) by a considerable margin. Its combination of three ceramides and hyaluronic acid, delivered in a formulation developed with dermatologists, represents the clearest case in the dataset of evidence-based value.