Squalene is a natural skin oil; its stable form, squalane, is a safe, well-tolerated moisturizer that softens skin, smooths texture, and supports the protective barrier. Deeper anti-aging claims — fewer wrinkles, more collagen — are not backed by human studies. The raw, unstable form can oxidize into an irritating, pore-clogging byproduct, so the stable form is preferred. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Skin hydration (stratum corneum capacitance) | Higher than baseline; well-hydrated, supple feel | Confirms the core emollient/occlusive benefit is occurring |
| Transepidermal water loss (TEWL) | Lower than baseline (reduced water evaporation) | Indicates the surface barrier is being supported |
| Skin-surface smoothness/texture | Improved smoothness, reduced roughness/flaking versus baseline | Tracks the most consistently reproduced benefit |
Cadence: First 1–2 weeks for hydration, smoothing, and any irritation; then monthly to confirm continued tolerance and benefit