CIRCADIA is an American professional skincare brand founded by physician and cellular biology researcher Dr Peter Pugliese. Its concept is based on chronobiology - the science of the body’s natural biological rhythms.

During the day, the skin directs its resources towards protection against ultraviolet radiation, pollution, oxidative stress and moisture loss.

At night, the processes of cellular renewal, repair and structural protein synthesis become more active.

CIRCADIA therefore distinguishes skincare by the time at which it acts: daytime formulas strengthen antioxidant and barrier protection, while night-time products use retinoids, peptides and restorative ingredients in harmony with the skin’s natural functions.