Rationale #1 The Serum

A barrier-strengthening serum powered by Vitamin B Complex to visibly calm redness, support hydration, and restore skin resilience.

RATIONALE #1 The Serum is a lightweight daily treatment serum formulated to strengthen the skin barrier, calm visible redness, and deeply hydrate combination and sensitive skin types. Powered by a proprietary Vitamin B Complex, soothing actives, and skin-identical lipids, this nourishing formula helps improve skin resilience while promoting a smoother, more balanced, and healthier-looking complexion. Designed for daily morning use, it layers effortlessly beneath moisturizers and SPF.

Key Benefits

• Helps visibly reduce redness
• Strengthens the skin barrier
• Deeply hydrates and replenishes
• Supports healthier-looking, more resilient skin
• Helps improve overall skin balance
• Lightweight, fast-absorbing texture
• Ideal for sensitive and combination skin types