Quick Comparison
| Ceramides | Squalane | |
|---|---|---|
| Typical Concentration | Look for products containing ceramide NP (ceramide 3), ceramide AP (ceramide 6-II), and ceramide EOP (ceramide 1) — these are the most abundant in human skin. Often combined with cholesterol and fatty acids in the optimal 3:1:1 ratio. Apply as moisturizer morning and night. | Can be used pure (100% squalane oil) or in formulations. Apply 2-3 drops after water-based products. Can be mixed with moisturizer. Safe for morning and night use. Non-comedogenic rating: 0-1 (very unlikely to clog pores). |
| Application | Topical (cream, lotion, serum). Best in emollient/occlusve formulations rather than water-based serums. | Topical (oil, serum, cream ingredient). Apply as the last step of skincare (after water-based products) or mix into moisturizer. |
| Research Papers | 10 papers | 10 papers |
| Categories |
Mechanism of Action
Ceramides
Ceramides are sphingolipids comprising a sphingoid base (sphingosine or phytosphingosine) amide-linked to a fatty acid—comprising ~50% of stratum corneum lipids. They integrate into the intercellular lipid matrix between corneocytes, forming the lamellar bilayer structure with cholesterol and free fatty acids that limits transepidermal water loss (TEWL). Optimal molar ratio is ~3:1:1 (ceramides:cholesterol:fatty acids). Topical ceramides (NP/3, AP/6-II, EOP/1) fill gaps from barrier damage by surfactants, retinoids, or inflammation. Cholesterol enables lamellar phase formation; fatty acids provide acidic pH for ceramide packing. Products restoring the complete ratio upregulate barrier repair genes (involucrin, filaggrin, transglutaminase) more effectively. Synthesis occurs via serine palmitoyltransferase and ceramide synthase in keratinocytes.
Squalane
Squalane is the fully hydrogenated form of squalene—a C30 isoprenoid hydrocarbon. As a saturated branched-chain hydrocarbon, squalane forms a non-occlusive emollient film that fills intercellular lipid spaces and reduces transepidermal water loss (TEWL) by approximately 20-30%. Squalene comprises ~12% of human sebum (synthesized via mevalonate pathway); squalane's structural similarity confers high biocompatibility and minimal comedogenic potential. Hydrogenation of squalene's six double bonds eliminates oxidative susceptibility—squalene peroxidizes with UV exposure while squalane remains stable. Squalane penetrates the stratum corneum and may support barrier lipid organization. Plant-derived squalane (sugarcane, olive) is structurally identical.
Risks & Safety
Ceramides
Common
Essentially none — ceramides are bioidentical to skin components.
Serious
None. Safe for all skin types including sensitive, eczema-prone, and rosacea.
Rare
Virtually no risk.
Squalane
Common
Essentially none. May cause breakouts in a small percentage of people despite low comedogenic rating.
Serious
None.
Rare
Allergic reaction is extremely rare.
Full Profiles
Ceramides →
Lipids that make up approximately 50% of the skin barrier by weight. Ceramides form the 'mortar' between skin cells (the 'bricks'), creating a waterproof barrier that prevents water loss and keeps irritants out. When the skin barrier is damaged — from over-exfoliation, harsh cleansers, retinoid use, or conditions like eczema — ceramide levels are depleted, and replenishing them is essential for recovery.
Squalane →
A lightweight, non-comedogenic emollient oil derived from squalene — a lipid naturally produced by human sebaceous glands. Squalane (the hydrogenated, stable form) mimics the skin's natural oils, making it an excellent moisturizer that rarely causes breakouts. It softens skin, reduces water loss, and has antioxidant properties. Increasingly sourced from sugarcane and olives rather than shark liver.