28 Day Skin Cycle
Overview
Your skin is constantly renewing itself. About every 28 days, new skin cells form, rise to the surface, and replace older cells — helping maintain clarity, strength, and radiance. This process, known as the skin cycle, plays a vital role in overall skin health. However, as we age and accumulate environmental exposure, this cycle gradually slows down. Understanding how renewal works — and how to support it — is key to preserving your skin’s vitality and long-term resilience.
What Is the 28-Day Skin Cycle?
The skin cycle refers to the journey of skin cells from where they form in the deepest layer of the epidermis to when they are eventually shed from the surface. New cells are continuously produced in the basal layer and gradually move upward as they mature. At the surface, older cells naturally slough off, revealing fresh skin underneath. This finely balanced process takes about 28 days in healthy, youthful skin and is essential for maintaining smoothness, hydration, and a strong skin barrier.
What Impacts the Skin Cycle?
In younger skin, cell turnover is rapid — contributing to clarity, luminosity, and an even tone. As we age, this regenerative process gradually slows, leading to dullness, dehydration, uneven texture, and visible signs of aging. Additional factors can further disrupt renewal, including:
- UV exposure, which accelerates cellular damage
- Pollution, which increases oxidative stress
- Lifestyle habits, including stress, sleep, and nutrition
- Hormonal changes, particularly during menopause, which weaken barrier function and slow regeneration
Over time, this cumulative stress impairs the skin’s natural ability to repair and renew itself.
How to Support Healthy Skin Renewal
[TIP 1] — Gentle Cleansing
Effective cleansing and gentle exfoliation remove dead skin cells, impurities and excess oil — supporting optimal cellular turnover and skin clarity.
[TIP 2] — Strengthen + Hydrate
Targeted hydration and barrier-supporting actives help support elasticity, comfort and resilience as renewal slows with age.
[TIP 3] — Protect Daily
Daily comprehensive protection is essential to prevent cumulative sun damage — the leading cause of visible skin aging.
#4 The Nourishing Cleanser
Benefits
Gently cleanses, Nourishes, Amplifies suppleness,
#1 The Crème
Benefits
Hydrates, Amplifies suppleness, Nourishes,
The RATIONALE Approach
Our formulations are designed to work in harmony with the skin cycle — supporting renewal, strengthening the skin barrier, and protecting against environmental stressors. By aligning advanced formulation science with the skin’s natural rhythms, we help preserve skin health, function, and radiance at every stage of life.
Skin Questionnaire
Take our skin questionnaire to uncover the ritual designed just for you.