Ceramides (NP, AP, EOP)
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.
Ceramides (NP, AP, EOP)
Layer over the initial active. Operates at pH 5–6.5.
Biochemical Mechanism & Pharmacology
Ceramides (NP, AP, EOP) 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 Ceramides (NP, AP, EOP) 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 ✓Ceramides (NP, AP, EOP) ✓Broad-Spectrum SPF 50+ | •Tretinoin (All-Trans Retinoic Acid) •Ceramides (NP, AP, EOP) •Barrier Seal | •Tretinoin (All-Trans Retinoic Acid) •Ceramides (NP, AP, EOP) •Barrier Seal |
Obstetric & Pregnancy Safety Summary
View Full Pregnancy Directory →Ceramides (NP, AP, EOP) 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.