ISDIN Isdinceutics Retinal Intense Rejuvenating Serum 50ml

ISDIN Isdinceutics Retinal Intense is one of the most scientifically sophisticated retinoid serums available without a prescription — built around Retinaldehyde (Retinal), a vitamin A derivative that sits one enzymatic step from Retinoic Acid rather than the two steps required by Retinol. This proximity to the active form means Retinal delivers faster, more potent results than Retinol at equivalent concentrations, with fewer conversion failures in skin. The formula's biphasic design (oil and water phases that separate and must be shaken before use) keeps the Retinal in a stabilised lipid environment until application, protecting it from premature oxidation — a significant formulation advantage for a molecule that is inherently unstable.

Bakuchiol is included as a complementary active: in published clinical trials, Bakuchiol activates the same retinoid receptors (RARα and RARγ) as retinoids but through a different binding mechanism and without the skin barrier disruption that typically accompanies synthetic retinoid use. The combination of Retinal + Bakuchiol provides synergistic retinoid-pathway stimulation with reduced irritation risk. Melatonin — produced by the pineal gland at night and with well-documented antioxidant activity in skin — is included at a biologically relevant concentration to neutralise UV-delayed oxidative stress during the night repair window, when skin's own antioxidant defences are lowest. Niacinamide brightens and reduces post-retinoid sensitivity; Palmitoyl Tetrapeptide-7 provides collagen-stimulating backup to the retinoid signal. Clinical results: 43% reduction in wrinkles and fine lines after 1 month of nightly use.