Squalane (Biocompatible Hydrocarbon)
Tretinoin (All-Trans Retinoic Acid)
How to Layer These Actives in Your Routine
Tretinoin (All-Trans Retinoic Acid)
Apply first to clean, dry skin. Operates at pH 5–6.5.
Allows cutaneous acid mantle to equilibrate before the next step.
Squalane (Biocompatible Hydrocarbon)
Layer over the initial active. Operates at pH 5.5–7.
Biochemical Mechanism & Pharmacology
Squalane (Biocompatible Hydrocarbon) provides vital physiological lipids and humectants that reinforce the stratum corneum lipid matrix, preventing trans-epidermal water loss (TEWL) and buffering against irritation from Tretinoin (All-Trans Retinoic Acid) without attenuating its therapeutic cellular benefits.
Apply the lower viscosity product first, or buffer by applying Squalane (Biocompatible Hydrocarbon) prior to Tretinoin (All-Trans Retinoic Acid) for sensitive skin (the sandwich method).
Recommended 7-Day Routine Blueprint
| Morning (AM) Routine | Evening (Night A) | Evening (Night B) |
|---|---|---|
✓Gentle Cleanser ✓Squalane (Biocompatible Hydrocarbon) ✓Broad-Spectrum SPF 50+ | •Tretinoin (All-Trans Retinoic Acid) •Squalane (Biocompatible Hydrocarbon) •Barrier Seal | •Tretinoin (All-Trans Retinoic Acid) •Squalane (Biocompatible Hydrocarbon) •Barrier Seal |
Obstetric & Pregnancy Safety Summary
View Full Pregnancy Directory →Squalane (Biocompatible Hydrocarbon) is classified as PERMITTED during pregnancy, while Tretinoin (All-Trans Retinoic Acid) is classified as DEFER IN PREGNANCY under clinical guidelines. Always cross-reference with your physician if expecting.