MEDICUBE Deep Vita A Serum firms bakuchiol, niacinamide, squalane, peptides, panthenol, and collagen for youthful radiance. This serum combines a 5-layer retinoid complex—including retinol, retinal, retinyl palmitate, retinyl linoleate, and hypertolerant hydroxypinacolone retinoate—for powerful anti-aging effects with reduced irritation. Niacinamide, bakuchiol, and peptides brighten tone, support firming, and strengthen the skin barrier with antioxidant-rich oils. Squalane, panthenol, centella extracts, hyaluronic acid, and ceramide NP deeply hydrate and soothe to counteract dryness or sensitivity. Clinically shown to increase collagen synthesis by 158%, it leaves skin smoother, firmer, and brighter with consistent nightly use.