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