Circadia was founded on the science of circadian rhythms, the understanding that the skin operates on a biological clock that governs when it repairs, renews, and defends itself. The peak repair window happens at night, when the skin's natural cell turnover rate is highest, blood flow to the skin increases, and the absence of UV exposure means that regenerative processes can run without interruption. Nighttime Repair Retinol Cream was formulated specifically to capitalize on that window, delivering actives that align with and amplify what the skin is already trying to do while you sleep.
Retinyl Acetate, the formula's Vitamin A source, is an ester form of retinol that converts to retinoic acid progressively within the skin. This conversion pathway makes it significantly more tolerable than pure retinol while still delivering the same core benefits: accelerated cell turnover, free radical scavenging, UV damage repair, and support for keratinocyte differentiation and proliferation. It is appropriate for those new to Vitamin A as well as those who want a reliable nightly maintenance dose without the intensity of higher-percentage formulas.
SK-Influx, a ceramide complex containing Ceramide NP, Ceramide AP, Ceramide EOP, Cholesterol, and Phytosphingosine, addresses the barrier dimension of aging skin directly. As the skin ages, its ceramide content declines, weakening the barrier and allowing transepidermal water loss to accelerate. SK-Influx replenishes these critical lipids, restoring the barrier's structural integrity and locking in the hydration that supports effective overnight repair.
Synchrolife is Circadia's proprietary chronobiology active, formulated to rebalance the skin's circadian clock when it has been disrupted by stress, poor sleep, blue light exposure, or environmental factors. Skin that is out of sync with its circadian rhythm shows it visibly through fatigue, dullness, and reduced resilience. Synchrolife helps restore that rhythm, making the skin more responsive to the repair signals that drive genuine overnight renewal.
Timecode targets the chronic low-grade inflammation that silently accelerates visible aging by degrading collagen, reducing elasticity, and deepening fine lines over time. By calming that inflammatory baseline, Timecode allows the skin to redirect resources toward regeneration rather than constant inflammatory response.
Palmitoyl Tripeptide-38 and Palmitoyl Tetrapeptide-7 bring collagen-stimulating and anti-inflammatory peptide activity. Niacinamide supports barrier function and reduces redness. Tetrahexyldecyl Ascorbate, a stable oil-soluble Vitamin C, provides antioxidant support and brightening. Ergothioneine, one of the most potent naturally occurring antioxidants, protects against oxidative stress at the cellular level. Centella Asiatica (Asiaticoside, Madecassic Acid, Asiatic Acid) contributes wound-healing, collagen-supporting, and calming botanical action. Chrysin, a natural bioflavonoid, provides additional antioxidant and anti-inflammatory support. Rosemary Leaf Extract and Tocopherol complete the antioxidant complex.
