Niacinamide (Vitamin B3)
Retinaldehyde (Retinal)
How to Layer These Actives in Your Routine
Niacinamide (Vitamin B3)
Apply first to clean, dry skin. Operates at pH 5–6.5.
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
Niacinamide (Vitamin B3) and Retinaldehyde (Retinal) operate via distinct physiological mechanisms without reactive cross-oxidation or competing receptor antagonisms. They can be safely integrated into the same routine when sequenced properly from thinnest to thickest consistency.
Apply Niacinamide (Vitamin B3) (pH 5–6.5, Viscosity Tier 2) first. Wait 1–2 minutes for absorption, then follow with Retinaldehyde (Retinal).
Recommended 7-Day Routine Blueprint
| Morning (AM) Routine | Evening (Night A) | Evening (Night B) |
|---|---|---|
✓Gentle Cleanser ✓Niacinamide (Vitamin B3) ✓Broad-Spectrum SPF 50+ | •Niacinamide (Vitamin B3) •Retinaldehyde (Retinal) •Barrier Cream | •Niacinamide (Vitamin B3) •Retinaldehyde (Retinal) •Barrier Cream |
Obstetric & Pregnancy Safety Summary
View Full Pregnancy Directory →Niacinamide (Vitamin B3) 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.