The best moisturiser ingredients — what actually works and why.

Most moisturisers are purchased on the basis of texture, packaging, or brand association. Very few are chosen based on what they actually contain. This is unfortunate, because the ingredient list predicts the outcome more reliably than the price or the category descriptor.

A well-formulated moisturiser works by addressing three different mechanisms simultaneously. Understanding those mechanisms makes it possible to read a label intelligently — and to buy for what the skin actually needs rather than for what the marketing implies.

The three-category framework

Moisturisers work through three distinct mechanisms: attracting water to the skin (humectants), smoothing and sealing the skin surface (emollients), and preventing water from escaping back out (occlusives). Most effective moisturisers include all three, in varying ratios depending on the skin type they are designed for.

Applying only a humectant without an emollient or occlusive can actually pull water from the skin in low-humidity environments rather than from the air. Applying only an occlusive seals in whatever is already there — useful for wet-wrap therapy on very dry skin, but not sufficient as a standalone approach. The combination is what produces lasting hydration.

Humectants — attracting water

Humectants are hygroscopic molecules that bind water through hydrogen bonding, drawing it from the deeper layers of the skin (and, in humid environments, from the air) to the upper epidermis.

Hyaluronic acid is the most widely recognised humectant. It can theoretically bind up to 1,000 times its weight in water. Molecular weight matters: high-molecular-weight HA (>1,000 kDa) sits on the skin surface, reduces TEWL, and produces the visible plumping effect. Low-molecular-weight HA (<50 kDa) penetrates more deeply but can paradoxically cause irritation in sensitive skin at high concentrations. Formulations using multiple molecular weights — often listed as "sodium hyaluronate" alongside "hydrolysed hyaluronic acid" — address both layers. Apply to damp skin before sealing with a moisturiser.

Glycerin is among the most reliable and well-studied humectants available. At 3–5% concentration, it draws water effectively from both the skin and the environment. It appears in nearly every moisturiser at an effective concentration. Its reputation for feeling sticky does not reflect its performance — in a properly formulated product, the glycerin is not the last ingredient the skin perceives.

Panthenol (pro-vitamin B5) is a dual-function humectant and wound-healing agent. It is metabolised to pantothenic acid in the skin, which supports barrier function and has anti-inflammatory properties. Effective at 1–5%.

Urea is underrated. At 3–10%, it is a humectant with mild keratolytic properties — it softens and loosens the bonds between dead skin cells, making it particularly effective for very dry, rough, or keratosis-pilaris-prone skin. At concentrations above 10%, it acts as a chemical exfoliant. Low-concentration urea (2–5%) is also anti-itch. Often found in body moisturisers and foot creams; less common in facial formulations but genuinely effective.

Beta-glucan (from oats or yeast) is both a humectant and an anti-inflammatory active. It is well-suited to reactive skin types and those with rosacea or eczema-prone skin.

Emollients — smoothing and softening

Emollients fill the spaces between corneocytes (the flattened dead cells of the stratum corneum) and smooth the skin surface. This structural smoothing improves the way the skin reflects light — which is the mechanism behind glowing or dewy skin — and reduces the rough, scaly texture associated with barrier compromise.

Squalane is an excellent emollient for all skin types, including oily and acne-prone. Its comedogenic rating is 0–1 (effectively non-comedogenic). It mimics the skin's own squalene — a lipid produced naturally by sebaceous glands — and absorbs quickly without leaving a greasy film. Applied to damp skin before a moisturiser, it significantly improves hydration retention.

Ceramides are essential barrier lipids. The stratum corneum's lipid matrix is approximately 50% ceramides, 25% cholesterol, and 15% fatty acids. When the barrier is compromised — through ageing, over-exfoliation, environmental exposure, or genetic predisposition — ceramide levels drop and TEWL increases. Ceramide-rich moisturisers replenish this deficit directly. Look for ceramide NP, ceramide AP, or ceramide EOP on the label. The most effective barrier-repair formulations approximate the 3:1:1 ceramide:cholesterol:fatty acid ratio described by dermatologist Peter Elias.

Fatty acids appear in moisturisers as plant oils or synthesised components. Linoleic acid (found in rosehip, sunflower, evening primrose) is lighter and less comedogenic — good for oily and acne-prone skin. Oleic acid (found in argan, marula, olive) is richer and more occlusive — better for dry and mature skin but higher comedogenic potential for acne-prone skin. The ratio in a plant oil determines whether it suits your skin type.

Shea butter is rich in oleic and stearic acid. Highly effective emollient; widely used. Higher comedogenic potential for acne-prone facial skin; generally well-tolerated on body skin.

Niacinamide at 2–5% in a moisturiser functions as a barrier-supporting active: it increases ceramide and fatty acid synthesis in the skin, reduces TEWL, and has an anti-inflammatory and sebum-regulatory effect. It is not a traditional emollient but produces emollient-adjacent outcomes over time.

Occlusives — sealing in moisture

Occlusives form a physical layer on the skin's surface that slows water evaporation. They are the most effective category for reducing TEWL — but they seal in whatever is already present, so they must be applied after humectants and emollients, not instead of them.

Petrolatum (petroleum jelly) is the gold standard occlusive. It reduces TEWL by approximately 98% and is non-comedogenic — despite its reputation, petrolatum does not clog pores. It is used in wound care and post-procedure recovery precisely because of its barrier-forming efficacy. Applied as the last step on damp skin in the PM routine, it is highly effective for dry, eczematous, or chronically dehydrated skin.

Dimethicone is a silicone-based occlusive that is lightweight, non-greasy, and non-comedogenic. It provides a meaningful reduction in TEWL while remaining comfortable on all skin types. Found in most mainstream moisturisers. Often the reason a light lotion still performs well despite its texture.

Lanolin is highly effective — comparable to petrolatum — but carries an allergy risk in approximately 1–3% of people, typically those with wool sensitivity. Effective for very dry and compromised skin for those who tolerate it.

What your skin type needs

Oily skin: lightweight humectant serums (glycerin, HA) plus a minimal emollient (squalane or niacinamide in a light lotion) plus a silicone occlusive (dimethicone). Avoid heavy plant-oil emollients and rich occlusives during the day — they create shine without adding to hydration.

Combination skin: zone-adapted or balanced formulations with moderate humectant + emollient content. A gel-cream or lotion with ceramides and glycerin works well for most.

Dry skin: all three categories in higher concentrations. Richer emollients (shea, ceramide complex) and more significant occlusives (petrolatum-based overnight mask or layered squalane) at the PM step. Humectants applied to damp skin before sealing.

Mature skin: prioritise ceramide replenishment and richer emollients. The skin's natural ceramide production declines with age; ceramide-rich formulations directly address the mechanism of ageing-associated dryness. More occlusion at night.

Sensitive and reactive skin: fragrance-free; avoid essential oils; prefer beta-glucan and centella-containing formulations; ceramide:cholesterol:fatty acid barrier repair.

When a cheaper moisturiser outperforms an expensive one

A well-formulated drugstore moisturiser containing glycerin, petrolatum, and dimethicone frequently outperforms a premium formulation built around novel actives, botanical extracts, and elegant marketing language. The barrier does not process branding.

What a more expensive moisturiser may genuinely offer: a higher concentration of a specific active (ceramides, peptides, niacinamide at therapeutic doses), a better skin feel for compliance, or a formulation system that enhances ingredient delivery. These can be worth the price. But the baseline — a humectant, an emollient, and an occlusive — is available at every price point.

The most reliable indicator of a moisturiser that will work is an ingredient list where the humectant appears in the first five ingredients, the emollient provides meaningful coverage, and the formula carries no fragrance or essential oils for a reactive skin type. Everything else is secondary.