ISDINCEUTICS Retinal Intense Serum 50ml is a dual-phase night serum formulated to reduce fine lines and wrinkles, enhance skin elasticity, and promote a smoother, more even complexion. Its key ingredients include 0.1% retinaldehyde, a potent vitamin A derivative that accelerates skin renewal; bakuchiol, a natural retinol alternative that improves firmness; melatonin, which acts as an antioxidant during the night; Vit-A-Tech complex to stimulate cell turnover; and niacinamide to soothe and hydrate the skin. Suitable for all skin types, this serum is designed for nighttime use, with gradual introduction recommended for first-time retinoid users.​