Le Sérum – Excellence Code

Exceptional Serum — Longevity Infusion. Yon-Ka's most concentrated longevity formula to date, with visible results starting in just 7 days⁴.

Le Sérum is engineered with a 360° approach to skin longevity, targeting three key biological pathways: limiting cellular senescence, boosting cellular vitality, and supporting a balanced skin microbiome. At its heart is patented Phyto-Fermented Jasmine, sourced from Grasse, France — clinically shown to increase oxytocin expression by 210%, reconnecting skin and senses for visibly rejuvenated, healthier-looking skin.

• Alpine Willowherb — ethically sourced from the Swiss Alps, helps reduce the accumulation of senescent ("zombie") cells that accelerate skin aging
• Peach Leaf Extract — helps stimulate SIRT-1, a key longevity protein supporting skin regeneration over time
• Pre-Postbiotic Complex — helps maintain a balanced skin microbiome by supporting hBD3, a key marker of skin's natural defenses

Results: +72% skin hydration in just 1 hour · skin appears up to 6 years younger in 2 weeks · -20% wrinkles² · +67% more even skin tone².

99.5% natural origin. Light, nectar-like texture. Patented airless pump packaging.

30ml.

² % satisfaction – self assessment under dermatological control – day 28 – 20 women – aged 45–70 – all skin types, including 50% sensitive skin. ⁴ % satisfaction on day 7 – In use test under dermatological control – day 56 – 20 women – aged 45–70 – all skin types, including 50% sensitive skin. Clinical evaluation of skin flora and microbiota balance conducted on 21 volunteers after 28 days of use.